Photovoltaic cell module and photovoltaic system

Abstract

The utility model discloses a photovoltaic cell assembly and a photovoltaic system, and relates to the photovoltaic cell field, the photovoltaic cell assembly comprises a first cell group, an electric connection group and a second cell group, the electric connection group is arranged between the first cell group and the second cell group, the first cell group comprises a plurality of first cells, and the second cell group comprises a plurality of second cells. The first battery pack comprises a plurality of first battery pieces, the second battery pack comprises a plurality of second battery pieces, the electric connection group comprises a first electric connection piece, and the electrode faces of the first battery pieces and the electrode faces of the second battery pieces are located on the two opposite sides of the first electric connection piece respectively. The two sides of the first electric connecting piece are electrically connected with the electrode face of the first battery piece and the electrode face of the second battery piece respectively. The photovoltaic system comprises the photovoltaic cell assembly. According to the utility model, the double-sided rate can be greatly improved, the generating capacity of the assembly is improved, and the single-watt cost is reduced.

Description

Technical Field

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

[0002] The typical structure and manufacturing process of existing photovoltaic (PV) modules are as follows: front glass, front encapsulant film, solar cells, solder ribbons, back encapsulant film, back glass, and frame. The solar cells are electrically connected via solder ribbons, which are laid between the cell strings to form the current conduction path within the module. This structure relies on solder ribbons to interconnect the cells; therefore, the electrode surfaces of existing PV modules have numerous grid lines and solder ribbon structures. The disadvantage of this structure is that traditional module structures typically only have power generation capability on the front side. Due to the shading of the solder ribbons, grid lines, and other structures, as well as limitations in the encapsulation design, the bifaciality (the ratio of power generation efficiency on the front and back sides) on the back side is far below 100%, sometimes even only achieving single-sided output. This severely restricts the improvement of power generation efficiency under complex lighting conditions. Moreover, with this hindered improvement in power generation efficiency, the cost per watt of the module cannot be effectively reduced. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a photovoltaic cell module and photovoltaic system that can significantly improve the bifaciality, increase the power generation of the module, and thus reduce the cost per watt.

[0004] To address the aforementioned technical problems, this utility model provides a photovoltaic cell module, including a first cell group, an electrical connection group, and a second cell group, wherein the electrical connection group is disposed between the first cell group and the second cell group.

[0005] The first battery pack includes a plurality of first battery cells, the second battery pack includes a plurality of second battery cells, and the electrical connection group includes a first electrical connector. The electrode surfaces of the first battery cells and the electrode surfaces of the second battery cells are respectively located on opposite sides of the first electrical connector, and the two sides of the first electrical connector are electrically connected to the electrode surfaces of the first battery cells and the electrode surfaces of the second battery cells, respectively.

[0006] The first battery cell has a first positive grid line and a first negative grid line on its electrode surface, and the second battery cell has a second positive grid line and a second negative grid line on its electrode surface. The positions of the first positive grid line and the second positive grid line are corresponding, and the positions of the first negative grid line and the second negative grid line are corresponding.

[0007] The number of the first electrical connectors is multiple, with some of the first electrical connectors having their two sides connected between the first positive grid line and the second positive grid line, and some of the first electrical connectors having their two sides connected between the first negative grid line and the second negative grid line.

[0008] As an improvement to the above scheme, the number and position of the first battery cells correspond to the number and position of the second battery cells, and the plurality of first battery cells and the plurality of second battery cells are arranged along the first direction.

[0009] As an improvement to the above solution, the first electrical connector extends along the first direction and is electrically connected to the first battery cell and the second battery cell, respectively.

[0010] As an improvement to the above solution, the width of the first electrical connector ranges from 0.5mm to 12mm.

[0011] As an improvement to the above solution, a first separator is also provided between the first battery pack and the second battery pack.

[0012] As an improvement to the above scheme, the light transmittance of the first diaphragm is greater than 95%.

[0013] As an improvement to the above solution, the first diaphragm is disposed in the first electrical connector on the side closer to the first battery pack or on the side closer to the second battery pack.

[0014] As an improvement to the above solution, the first separator is an integral structure, and the first separator extends along the length direction of the first battery pack or the second battery pack.

[0015] As an improvement to the above solution, there are multiple first separators, and the position and number of the first separators correspond to the position and number of the first battery cell or the second battery cell, respectively.

[0016] As an improvement to the above solution, the first diaphragm is provided with perforated holes, and the perforated holes correspond to the positions of the first electrical connector.

[0017] As an improvement to the above solution, the perforated hole extends along the length of the first electrical connector, and one side of the first electrical connector passes through the perforated hole to connect with the first battery cell or the second battery cell.

[0018] As an improvement to the above solution, the ratio of the width of the hollow hole to the width of the first electrical connector is in the range of 1.1-1.8.

[0019] As an improvement to the above solution, there are multiple hollow holes, which are distributed along the length of the first electrical connector. Part of the first electrical connector passes through the hollow holes and connects to the first battery cell or the second battery cell.

[0020] As an improvement to the above solution, the perforation corresponds at least to the position of the pad point provided on the first or second battery cell.

[0021] As an improvement to the above solution, the ratio of the width of the hollow hole to the width of the first electrical connector is in the range of 1.2-2.0.

[0022] As an improvement to the above solution, the electrical connection group further includes a second electrical connector, which extends along a second direction, and a portion of the first electrical connector is electrically connected to the second electrical connector.

[0023] As an improvement to the above scheme, the second direction is perpendicular to the first direction.

[0024] As an improvement to the above solution, the second electrical connector is disposed on the outside of the first battery pack and the second battery pack; and / or the second electrical connector is disposed on the electrode surface of the first battery cell and the electrode surface of the second battery cell.

[0025] As an improvement to the above solution, the photovoltaic cell module further includes a first glass, a second separator, a third separator, and a second glass, wherein the first glass, the second separator, the first battery pack, the electrical connection group, the second battery pack, the third separator, and the second glass are arranged in sequence.

[0026] This utility model also discloses a photovoltaic system, including the photovoltaic cell module described above.

[0027] Implementing this utility model has the following beneficial effects:

[0028] This utility model's photovoltaic cell module includes a first cell group, an electrical connection group, and a second cell group. The electrical connection group is disposed between the first cell group and the second cell group. The first cell group includes multiple first cells, and the second cell group includes multiple second cells. The electrical connection group includes a first electrical connector. The electrode surfaces of the first and second cells are located on opposite sides of the first electrical connector. The two sides of the first electrical connector are electrically connected to the electrode surfaces of the first and second cells, respectively. By using the first electrical connector to construct an electrical connection path between the first and second cell groups, the limitation of traditional packaging design on back-side power generation capability is overcome. This allows for double-sided light reception, significantly improving the bifaciality of the module and enabling the module to fully release its power generation under complex lighting conditions, thereby effectively reducing the cost per watt of the module. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the disassembled structure of the photovoltaic cell module of this utility model;

[0030] Figure 2 This is a structural schematic diagram of the first battery pack and the first electrical connector of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the first battery pack and the second battery pack after they are connected.

[0032] Figure 4 This is a cross-sectional structural diagram of the first embodiment of the present invention;

[0033] Figure 5 This is a cross-sectional structural schematic diagram of the second embodiment of the present invention;

[0034] Figure 6 This is a cross-sectional structural schematic diagram of the third embodiment of the present invention;

[0035] Figure 7 This is a cross-sectional structural schematic diagram of the fourth embodiment of the present invention;

[0036] Figure 8 This is a cross-sectional structural schematic diagram of the fifth embodiment of this utility model;

[0037] Figure 9 This is a cross-sectional structural schematic diagram of the sixth embodiment of this utility model;

[0038] Figure 10 This is a cross-sectional structural schematic diagram of the seventh embodiment of the present invention;

[0039] Figure 11 This is a schematic diagram of the structure of the second electrical connector and the first battery pack in the eighth embodiment of this utility model;

[0040] Figure 12 This is a schematic diagram of the disassembled structure of the ninth embodiment of this utility model. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0042] See Figures 1-3This utility model discloses a photovoltaic cell module, including a first cell group 1, an electrical connection group 2, and a second cell group 3, with the electrical connection group 2 disposed between the first cell group 1 and the second cell group 3. The first cell group 1 includes multiple first cells 11, and the second cell group 3 includes multiple second cells 31. The independent arrangement of the two groups of cells creates conditions for the module to receive light from both sides. The electrical connection group 2 includes a first electrical connector 21, with the electrode surfaces of the first cells 11 and the second cells 31 located on opposite sides of the first electrical connector 21. The two sides of the first electrical connector 21 are electrically connected to the electrode surfaces of the first cells 11 and the second cells 31, respectively. The first electrical connector 21 is a solder ribbon connecting the first battery cell 11 and the second battery cell 31. The electrode surfaces of the first battery cell 11 and the second battery cell 31 are the backlight surfaces. The cooperation between the electrode surfaces of the first battery cell 11 and the second battery cell 31 and the first electrical connector 21 forms the current conduction path inside the module. Since the first battery cell 11 and the second battery cell 31 respectively block the two sides of the first electrical connector 21, the interference of the solder ribbon on the light in the traditional structure can be completely eliminated.

[0043] In practical applications, photovoltaic modules can receive light from both sides. Whether the front receives direct sunlight or the back receives reflected sunlight (such as in complex lighting environments like ground reflection or building reflection), the first cell 11 and the second cell 31 can simultaneously perform photoelectric conversion. This feature significantly improves the bifaciality of the module, allowing the module's power generation to be fully released. The increase in power generation directly reduces the overall investment cost of the module, ultimately achieving an effective reduction in the cost per watt of the module.

[0044] The beneficial effects of this utility model embodiment are as follows:

[0045] This embodiment of the photovoltaic cell module includes a first cell pack 1, an electrical connection group 2, and a second cell pack 3. The electrical connection group 2 is disposed between the first cell pack 1 and the second cell pack 3. The first cell pack 1 includes a plurality of first cells 11, and the second cell pack 3 includes a plurality of second cells 31. The electrical connection group 2 includes a first electrical connector 21. The electrode surfaces of the first cells 11 and the second cells 31 are respectively located on opposite sides of the first electrical connector 21. The two sides of the first electrical connector 21 are electrically connected to the electrode surfaces of the first cells 11 and the second cells 31, respectively. By using the first electrical connector 21 to construct an electrical connection path between the first cell pack 1 and the second cell pack 3, the limitation of the back-side power generation capability of the traditional packaging design is broken, enabling double-sided light reception, significantly improving the bifaciality of the module, and allowing the power generation of the module to be fully released under complex lighting conditions, thereby effectively reducing the cost per watt of the module.

[0046] See Figure 3The number and position of the first solar cells 11 correspond to the number and position of the second solar cells 31, respectively, and the multiple first solar cells 11 and multiple second solar cells 31 are arranged along the first direction. The first solar cell group 1 and the second solar cell group 3 form perfectly matched power generation areas on both sides of the photovoltaic module, ensuring full utilization of the light-receiving area on both sides of the module. This improves the uniformity of light reception on both sides and enhances the uniformity of stress on the first solar cells 11 and the second solar cells 31.

[0047] The first electrical connector 21 extends along the first direction and is electrically connected to the first battery cell 11 and the second battery cell 31 respectively, so that a single first electrical connector 21 can simultaneously form an effective electrical connection with multiple first battery cells 11 and multiple second battery cells 31 arranged along the first direction.

[0048] See Figure 4 The first solar cell 11 has a first positive grid line 111 and a first negative grid line 112 on its electrode surface, and the second solar cell 31 has a second positive grid line 311 and a second negative grid line 312 on its electrode surface. The positions of the first positive grid line 111 and the second positive grid line 311 correspond to each other, and the positions of the first negative grid line 112 and the second negative grid line 312 correspond to each other. This corresponding grid line arrangement ensures that when the first electrical connector 21 connects the first solar cell 11 and the second solar cell 31, the contact points on both sides can be accurately aligned with the grid line positions, forming a symmetrical force-bearing structure. This evenly distributes the pressure on both sides of the first electrical connector 21, preventing damage to the module's structural integrity due to uneven stress during lamination. Simultaneously, the uniform stress state also enhances the overall strength of the photovoltaic module, reducing the risk of damage caused by structural stress concentration during transportation, installation, and use.

[0049] See Figure 4 The diagram shows a cross-sectional view of the first embodiment of this utility model. In this first embodiment, there are multiple first electrical connectors 21. Some of the first electrical connectors 21 are connected on both sides between the first positive grid line 111 and the second positive grid line 311; these first electrical connectors 21 are solder strips corresponding to the positive grid lines. Other first electrical connectors 21 are connected on both sides between the first negative grid line 112 and the second negative grid line 312; these first electrical connectors 21 are solder strips corresponding to the negative grid lines. Furthermore, the distribution of multiple first electrical connectors 21 can further disperse the overall stress on the module, making the stress on the module more uniform during lamination and use, further enhancing structural stability, and providing reliable structural and circuit support for the module to maintain high-efficiency bifacial power generation and low cost per watt over the long term.

[0050] Since the first electrical connector 21 does not obstruct the light-receiving surfaces of the first battery cell 11 and the second battery cell 31, the width of the first electrical connector 21 can be wider than that of a traditional solder strip. The width of the first electrical connector 21 ranges from 0.5mm to 12mm. When a 0.5mm width is selected, it is suitable for scenarios with compact requirements for the overall thickness or internal space of the module (such as rooftop distributed photovoltaics). While ensuring the basic current conduction capacity, it will not increase the module volume, and can still maintain a stable electrical connection with the electrode surfaces of the first cell 11 and the second cell 31. When a 5mm width is selected, a balance can be achieved between the width and current conduction efficiency. The wider cross-section can improve the current carrying capacity and reduce the resistance loss during the current conduction process, which is suitable for scenarios with stable power generation efficiency requirements, such as conventional outdoor photovoltaic power stations. When a 12mm width is selected, it is suitable for scenarios with high current output requirements (such as centralized photovoltaic power stations). The wider first electrical connector 21 can further reduce conductivity loss. Since there is no need to worry about blocking the light-receiving surface, it is not limited by the narrow width design like traditional solder strips, completely breaking through the width limitation of traditional interconnect components, and improving circuit stability while ensuring power generation efficiency.

[0051] See Figure 5 In the second embodiment, a first separator 4 is further provided between the first battery pack 1 and the second battery pack 3 to prevent wear caused by contact between the electrode surfaces of the first battery cell 11 and the second battery cell 31, and to provide cushioning. The first separator 4, sandwiched between the first battery pack 1 and the second battery pack 3, physically isolates the electrode surfaces of the first battery cell 11 and the second battery cell 31, avoiding wear caused by direct contact, protecting the structural integrity of the electrode surfaces, and ensuring that the electrical connection between the first electrical connector 21 and the electrode surfaces is always reliable. Simultaneously, the cushioning effect of the first separator 4 can absorb the stress and deformation of the first battery cell 11, the second battery cell 31, and the first electrical connector 21 when the module is subjected to external impact, reducing the risk of damage to the internal structure of the module and providing structural protection for the module to maintain high-efficiency bifacial power generation over a long period.

[0052] Specifically, the first separator 4 has a light transmittance greater than 95%. Since the first separator 4 is located between the first battery pack 1 and the second battery pack 3, insufficient light transmittance would block light from passing through, affecting the second battery cell 31's reception of back-reflected light and thus reducing the module's bifaciality. However, the first separator 4 with a light transmittance greater than 95% allows most of the light to pass through. Among them, 96% light transmittance ensures that more than 96% of the effective light in the back-reflected light reaches the surface of the second battery cell 31 with virtually no light loss. 98% light transmittance is closer to the effect of unobstructed light transmission, further reducing light attenuation at the separator and ensuring that both the front direct light received by the first battery cell 11 and the back-reflected light received by the second battery cell 31 can fully participate in the photoelectric conversion process, avoiding power generation loss due to the separator blocking light.

[0053] The first diaphragm 4 can be installed in two locations; for details, please refer to [link / reference]. Figure 5 In the second embodiment, the first diaphragm 4 is disposed in the first electrical connector 21 on the side near the first battery pack 1. See also Figure 6 In the third embodiment, the first diaphragm 4 is disposed in the first electrical connector 21 on the side close to the second battery pack 3.

[0054] See Figure 7 In the fourth embodiment, the first separator 4 is an integral structure that can be laid as a whole between the first battery pack 1 and the second battery pack 3, and the first separator 4 extends along the length of the first battery pack 1 or the second battery pack 3. It should be noted that in the fourth embodiment, in order to achieve electrical connection between the first electrical connector 21 and the first battery cell 11 and the second battery cell 31, the first separator 4 needs to have pre-reserved holes in the area where the first electrical connector 21 is located. This allows the two sides of the first electrical connector 21 to make electrical contact with the first positive grid line 111 and the first negative grid line 112 of the first battery cell 1, and the second positive grid line 311 and the second negative grid line 312 of the second battery cell 3, respectively. The integral structure refers to the use of a fully connected structure in the areas of the first separator 4 other than the first electrical connector 21 to form the entire first separator 4 as a whole. The integral structure of the first separator 4 eliminates the need for splicing, avoiding the problems of isolation failure or uneven light transmission caused by gaps or misalignments at the splicing points when splicing multiple scattered separators, significantly improving installation convenience and isolation reliability. Furthermore, the whole-sheet laying method can fully cover all areas between the first battery pack 1 and the second battery pack 3 that are not located in the area of ​​the first electrical connector, eliminating the risk of electrode surface wear caused by incomplete protection. The flat diaphragm can fit more tightly to the battery pack and electrical connector, which not only enhances the buffering effect but also ensures uniform light transmission.

[0055] See Figure 8In the fifth embodiment, there are multiple first separators 4, and the position and number of the first separators 4 correspond to the position and number of the first battery cell 11 or the second battery cell 31, respectively. In this embodiment, multiple first separators 4 are arranged according to the position and number of the first battery cell 11 or the second battery cell 31. For example, one first separator 4 is arranged below each first battery cell 11 / second battery cell 31, or one first separator 4 corresponds to every two adjacent first battery cells 11 / second battery cells 31. This allows the first separator 4 to act only on the electrode surface area that needs to be protected, avoids ineffective blocking at the gaps, reduces the weight of the component, and also avoids the impact of separator wrinkles at the gaps on the flatness of the internal structure of the component. It should be noted that multiple first diaphragms 4 are arranged and laid out at certain intervals and distances, wherein the first connector 21 is disposed in the gap between two adjacent first diaphragms 4 so that the first connector 21 is exposed on the first diaphragm 4, so that the first connector 21 can make electrical contact with the first positive grid line 111 and the first negative grid line 112 of the first battery cell 1 and the second positive grid line 311 and the second negative grid line 312 of the second battery cell 3 respectively.

[0056] Furthermore, the first separator 4 is provided with a perforated hole 41, which corresponds to the position of the first electrical connector 21, so as to leave space for the first electrical connector 21 to make electrical contact with the first positive grid line 111 / second positive grid line 311 / first negative grid line 112 / second negative grid line 312. If the separator covers the connection area between the electrode surface of the battery cell and the interconnection component, it is easy to block the contact between the two, resulting in the inability to weld together. In this embodiment, the position of the perforated hole 41 corresponds to the first electrical connector 21, which can provide unobstructed space for the electrical connection between the first electrical connector 21 and each grid line without affecting the isolation and buffering function of the first separator 4, ensuring that the first electrical connector 21 can be welded together with the first positive grid line 111, the second positive grid line 311, the first negative grid line 112, and the second negative grid line 312.

[0057] See Figure 9 In the sixth embodiment, the perforation 41 is elongated and extends along the length of the first electrical connector 21. One side of the first electrical connector 21 passes through the perforation 41 and connects to the first battery cell 11 or the second battery cell 31. The elongated perforation 41 is adapted to the length of the first electrical connector 21, allowing the perforation 41 to completely cover the connection path between the first electrical connector 21 and the first battery cell 11 / second battery cell 31, ensuring that the first electrical connector 21 can fully contact the corresponding grid line along its length.

[0058] In the sixth embodiment, the ratio of the width of the perforated hole 41 to the width of the first electrical connector 21 is in the range of 1.1-1.8, so as to avoid the perforated hole 41 from obstructing the welding of the first electrical connector 21 and the grid line during pressure welding. When the ratio is 1.1, the width gap between the perforated hole 41 and the first electrical connector 21 is small, which is suitable for scenarios with high pressure welding precision. It can avoid the first diaphragm 4 from shifting during pressure welding due to excessive gap, and can also provide slight adjustment space for the first electrical connector 21 to prevent obstruction due to dimensional deviation during welding. When the ratio is 1.4, the gap size is moderate, which can balance the pressure welding operation space and the structural stability of the first diaphragm 4. It is suitable for conventional pressure welding processes, which can ensure that the welding tool can smoothly contact the connection area, and will not weaken the isolation and buffering capacity of the first diaphragm 4 due to excessive gap. When the ratio is 1.8, the gap is large, which is suitable for scenarios where the first electrical connector 21 has slight deformation or requires more operation space during pressure welding. It can effectively avoid the edge of the perforated hole 41 from obstructing the welding process and ensure that the first electrical connector 21 and the grid line form a firm weld.

[0059] See Figure 10 In the seventh embodiment, there are multiple perforated holes 41, distributed along the length of the first electrical connector 21. Parts of the first electrical connector 21 pass through the perforated holes 41 and connect to the first battery cell 11 or the second battery cell 31. When the first battery cell 11 / second battery cell 31 is an 0bb battery cell (without a main grid), the position of the perforated hole 41 corresponds to the position of the welding point of the first electrical connector 21. In traditional modules, if an 0bb battery cell is used, due to the lack of a main grid structure, the welding point needs to precisely correspond to the conductive area on the surface of the battery cell. If the separator is not specifically perforated, it can easily cover the welding point, leading to electrical connection failure. In this embodiment, however, the multiple perforated holes 41 are distributed dispersedly along the length of the first electrical connector 21, avoiding the problem of reduced structural integrity of the first separator 4 caused by full-piece perforation, and providing unobstructed space for the local welding position of the first electrical connector 21 through each perforated hole 41.

[0060] When the first solar cell 11 / second solar cell 31 has a main grid and a sub-grid, the perforation 41 corresponds at least to the position of the pad point provided on the first solar cell 11 or the second solar cell 31. In traditional modules, the pad point on the main grid is a critical area for welding. If the separator covers the pad point, the first electrical connector 21 will not be able to effectively adhere to the pad point for welding, thereby increasing conductivity loss or causing the weld to fall off. In this embodiment, the perforation 41 corresponds to the position of the pad point, which can provide sufficient space for the welding process, ensuring that the first electrical connector 21 can directly contact the pad point and form a firm weld, and ensuring that the current is smoothly conducted to the main grid and the sub-grid through the pad point.

[0061] In the seventh embodiment, the ratio of the width of the perforated hole 41 to the width of the first electrical connector 21 is in the range of 1.2-2.0. When the ratio is 1.2, the gap between the perforated hole 41 and the first electrical connector 21 is small, which is suitable for scenarios where the structural stability of the first diaphragm 4 is required (such as thin-cell modules). This can prevent the first diaphragm 4 from shifting during welding due to excessive gap, and can also provide sufficient space for the first electrical connector 21 to fit with the pad point or welding point, preventing welding obstruction. When the ratio is 1.6, the gap size is moderate, which is suitable for modules with conventional main and auxiliary grids or 0bb cells. It can balance the welding operation space and the structural strength of the first diaphragm 4, ensuring that the welding tool can smoothly contact the connection area, while the first diaphragm 4 can still maintain a good isolation and buffering effect. When the ratio is 2.0, the gap is large, which is suitable for scenarios where the first electrical connector 21 has slight deformation or the pad point distribution range is wide during welding. This can effectively prevent the edge of the perforated hole 41 from obstructing the welding process and ensure that the first electrical connector 21 and the pad point or welding point form a full fit.

[0062] See Figure 11 In the eighth embodiment, the electrical connection group 2 further includes a second electrical connector 22, which serves as a busbar to collect the current conducted by the plurality of first electrical connectors 21 extending along the first direction. The second electrical connector 22 extends along a second direction, and a portion of the first electrical connectors 21 is electrically connected to the second electrical connector 22. The second direction is perpendicular to the first direction. This vertical arrangement minimizes the current conduction path from the first battery cell 11 / second battery cell 31 to the second electrical connector 22, reducing resistance loss and preventing cross-blocking between the two.

[0063] The second electrical connector 22 is disposed on the outside of the first battery pack 1 and the second battery pack 3; and / or the second electrical connector 22 is disposed on the electrode surface of the first battery cell 11 and the electrode surface of the second battery cell 31. When the second electrical connector 22 is disposed on the outside of the first battery pack 1 and the second battery pack 3, it can completely avoid the light-receiving area of ​​the battery cell, reducing the potential shading of the second electrical connector 22 on the light, and the outer position facilitates docking with the external circuit of the module, simplifying the installation process. When the second electrical connector 22 is disposed on the electrode surface of the first battery cell 11 and the second battery cell 31 (for example, disposed in the middle or near the edge of the battery cell), it is suitable for large-size modules. The middle position can divide the current of the first electrical connector 21 into two segments and combine them, further shortening the conduction path and reducing the loss of long-distance current transmission in large-size modules. In addition, the middle position will hide the second electrical connector 22, which can also reduce the potential shading of the second electrical connector 22 on the light. The area of ​​the busbar 22 observed from the light-receiving side is smaller, or even completely hidden, making the overall aesthetics of the battery module better.

[0064] See Figure 12 In the ninth embodiment, the photovoltaic module further includes a first glass 5, a second separator 6, a third separator 7, and a second glass 8, arranged sequentially. The first glass 5, second separator 6, first battery pack 1, electrical connection group 2, second battery pack 3, third separator 7, and second glass 8 are arranged sequentially. Traditional photovoltaic module encapsulation structures are mostly "front glass - front encapsulant film - battery cell - solder ribbon - back encapsulant film - back glass." The combination of the back encapsulant film and glass only provides basic protection, and the back light cannot be fully utilized due to the solder ribbon blocking the back light. In this embodiment, the sequentially arranged multi-layer structure forms a symmetrical encapsulation system that combines protection and light transmission. Because each layer does not block the light-receiving areas of the first battery pack 1 and the second battery pack 3, the module can still achieve bi-sided light reception, providing encapsulation-level support for maintaining high bifaciality and stable power generation, further ensuring the effect of reducing cost per watt.

[0065] A photovoltaic system includes photovoltaic cell modules as described above. Because the system integrates these high bifaciality photovoltaic cell modules, it can fully utilize sunlight resources from both the front and back sides. When the system is deployed on rooftops, ground surfaces, or other locations, the first cell group 1 of the photovoltaic cell modules receives direct sunlight from the front, while the second cell group 3 receives reflected sunlight from the back. Both groups simultaneously perform photoelectric conversion, resulting in a significantly higher power generation under the same lighting conditions compared to traditional systems. Furthermore, the aforementioned photovoltaic cell modules achieve a reduction in cost per watt through optimized interconnection structure and encapsulation design. When multiple photovoltaic cell modules form a photovoltaic system, the overall system investment cost decreases in tandem with the reduction in the cost per watt of the modules.

[0066] The above are preferred embodiments of the present utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications are also considered to be within the protection scope of the present utility model.

Claims

1. A photovoltaic cell assembly, characterized by, The battery pack comprises a first battery group, an electric connection group and a second battery group, the electric connection group is arranged between the first battery group and the second battery group; The first battery group comprises a plurality of first battery pieces, the second battery group comprises a plurality of second battery pieces, the electric connection group comprises a first electric connection piece, the electrode surface of the first battery piece and the electrode surface of the second battery piece are respectively located on the opposite sides of the first electric connection piece, and the two sides of the first electric connection piece are respectively electrically connected with the electrode surface of the first battery piece and the electrode surface of the second battery piece; The electrode surface of the first battery piece is provided with a first positive grid line and a first negative grid line, the electrode surface of the second battery piece is provided with a second positive grid line and a second negative grid line, the positions of the first positive grid line and the second positive grid line correspond to each other, and the positions of the first negative grid line and the second negative grid line correspond to each other; The number of the first electric connection pieces is plural, and the two sides of part of the first electric connection pieces are connected between the first positive grid line and the second positive grid line, and the two sides of part of the first electric connection pieces are connected between the first negative grid line and the second negative grid line.

2. The photovoltaic cell assembly of claim 1, wherein, The number and position of the first battery pieces correspond to the number and position of the second battery pieces respectively, and the plurality of first battery pieces and the plurality of second battery pieces are arranged along a first direction.

3. A photovoltaic cell assembly according to claim 2, wherein, The first electric connection piece is arranged along the first direction and is electrically connected with the first battery piece and the second battery piece respectively.

4. The photovoltaic cell assembly of claim 1, wherein, The width of the first electric connection piece ranges from 0.5mm to 12mm.

5. The photovoltaic cell assembly of claim 2, wherein, A first diaphragm is further arranged between the first battery group and the second battery group.

6. The photovoltaic cell assembly of claim 5, wherein, The light transmittance of the first diaphragm is greater than 95%.

7. The photovoltaic cell assembly of claim 5, wherein, The first diaphragm is arranged on one side of the first electric connection piece close to the first battery group or on one side of the first electric connection piece close to the second battery group.

8. The photovoltaic cell assembly of claim 5, wherein, The first diaphragm is of an integrated structure, and extends along the length direction of the first battery group or the second battery group.

9. The photovoltaic cell assembly of claim 5, wherein, The number of the first diaphragm is plural, and the position and number of the first diaphragm correspond to the position and number of the first battery piece or the second battery piece respectively.

10. The photovoltaic cell assembly of claim 5, wherein, The first diaphragm is provided with a hollow hole, and the hollow hole corresponds to the position of the first electric connection piece.

11. The photovoltaic cell assembly of claim 10, wherein, The hollow hole extends along the length direction of the first electric connection piece, and one side of the first electric connection piece passes through the hollow hole to be connected with the first battery piece or the second battery piece.

12. The photovoltaic cell assembly of claim 11, wherein, The ratio of the width of the hollow hole to the width of the first electric connection piece ranges from 1.1 to 1.

8.

13. The photovoltaic cell assembly of claim 10, wherein, The number of the hollow hole is plural, and the plurality of hollow holes are distributed along the length direction of the first electric connection piece, and part of the positions of the first electric connection piece pass through the hollow hole to be connected with the first battery piece or the second battery piece.

14. The photovoltaic cell assembly of claim 13, wherein, The hollow hole at least corresponds to the position of the pad point arranged on the first battery piece or the second battery piece.

15. The photovoltaic cell assembly of claim 13, wherein, The ratio of the width of the hollow hole to the width of the first electric connection piece ranges from 1.2 to 2.

0.

16. The photovoltaic cell assembly of claim 13, wherein, The electric connection group further comprises a second electric connection member, the second electric connection member is arranged along a second direction, and a part of the first electric connection member is electrically connected with the second electric connection member.

17. The photovoltaic cell assembly of claim 16, wherein, The second direction is perpendicular to the first direction.

18. The photovoltaic cell assembly of claim 16, wherein, The second electric connection member is arranged outside the first battery group and the second battery group; and / or the second electric connection member is arranged on the electrode surface of the first battery sheet and the electrode surface of the second battery sheet.

19. The photovoltaic cell assembly of claim 1, wherein, The photovoltaic cell assembly further comprises a first glass, a second diaphragm, a third diaphragm and a second glass, which are sequentially arranged.

20. A photovoltaic system characterized by, The photovoltaic cell assembly comprises any one of claims 1-19.

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