A solar cell, a battery module and a photovoltaic system

Abstract

This invention relates to the field of photovoltaic technology, providing a solar cell, a battery module, and a photovoltaic system. The solar cell includes: a battery body, comprising a first sub-cell and a second sub-cell arranged adjacent to each other along a first direction, with a cutting area between the first and second sub-cells; and an insulating protective film disposed on the front side of the battery body, covering the front sides of both the first and second sub-cells, with a perforated area. The insulating protective film on the first and second sub-cells is non-axially symmetrical about the center line of the cutting area, or non-centrally symmetrical about the center of the cutting area. This solar cell prevents scratches on the front structure of the battery body and facilitates the differentiation of the first and second sub-cells after cutting.

Description

Technical Field

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

[0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Under sunlight, a solar cell generates a photocurrent, which is then output as electrical energy through electrodes. In recent years, solar cell manufacturing technology has continuously improved, production costs have decreased, and conversion efficiency has increased. As a result, solar cell power generation has become increasingly widespread and is a crucial energy source for electricity supply.

[0003] In existing technologies, solar cells typically do not have a dedicated protective structure on the front side. This is especially true for back-contact solar cells. Since the grid lines on the back side of the solar cell are not specially protected, the front structure of the solar cell is easily scratched by the grid lines on the back side when the solar cells are stacked and stored. This greatly affects the front structure of the solar cell and can easily lead to defects in the solar cell. Utility Model Content

[0004] This invention provides a solar cell designed to solve the problem that the front of a solar cell is easily scratched, leading to malfunctions.

[0005] This invention is implemented by providing a solar cell, comprising:

[0006] A battery body, comprising a first sub-battery and a second sub-battery arranged adjacent to each other along a first direction, a cutting region being provided between the first sub-battery and the second sub-battery, the cutting region extending along a second direction, the second direction intersecting the first direction; and

[0007] An insulating protective film is disposed on the front side of the battery body, which covers the front sides of both the first sub-battery and the second sub-battery. The insulating protective film has a hollow area. The insulating protective film on the first sub-battery and the insulating protective film on the second sub-battery are arranged non-axially symmetrically about the center line of the cut area, or the insulating protective film on the first sub-battery and the insulating protective film on the second sub-battery are arranged non-centrally symmetrically about the center of the cut area.

[0008] Preferably, the insulating protective film includes a plurality of film lines arranged at intervals in sequence, the hollow area includes a gap area disposed between adjacent film lines, the film lines on the first sub-battery and the film lines on the second sub-battery are arranged non-axially symmetrically about the center line of the cutting area, or the film lines on the first sub-battery and the film lines on the second sub-battery are arranged non-centrally symmetrically about the center of the cutting area.

[0009] Preferably, the hollowed-out area includes at least one first identification area disposed on the first sub-battery and used for setting an identification, and at least one second identification area disposed on the second sub-battery and used for setting an identification.

[0010] Preferably, the identifier is a QR code.

[0011] Preferably, the first marking area and the second marking area are arranged in an asymmetrical manner.

[0012] Preferably, the length of the membrane line on the first sub-cell located between the first marking area and the cutting area is different from the length of the membrane line on the second sub-cell located between the second marking area and the cutting area.

[0013] Preferably, the first marking area and the second marking area have different sizes.

[0014] Preferably, the first marking area and the second marking area are staggered in the first direction.

[0015] Preferably, the number of the first identification area is different from the number of the second identification area.

[0016] Preferably, the first marking area and the second marking area are arranged symmetrically about the center line of the cutting area.

[0017] Preferably, the insulating protective film includes marking lines disposed on the first sub-cell or the second sub-cell.

[0018] Preferably, the marking line is located at the edge of the front of the first sub-cell or the edge of the front of the second sub-cell.

[0019] Preferably, the width of at least one of the membrane lines in the first sub-cell or the second sub-cell is greater than the width of the remaining membrane lines.

[0020] This invention also provides a battery assembly, including the aforementioned solar cell or segments obtained by cutting it.

[0021] This utility model also provides a photovoltaic system, including the above-mentioned battery components.

[0022] This utility model provides a solar cell that protects the front of the solar cell body by setting an insulating protective film on the front side of the cell body. This protects the front structure of the solar cell body from scratches during transportation or stacking storage, greatly protecting the front structure and ensuring its structural integrity. Simultaneously, the cell body is configured to include a first sub-cell and a second sub-cell arranged adjacent to each other along a first direction. The insulating protective film on the cell body covers the front sides of both the first and second sub-cells. After the solar cell is cut to form the first and second sub-cells, both front sides of the first and second sub-cells are insulated. The insulating protective film is used for protection, and the insulating protective film on the first sub-cell and the insulating protective film on the second sub-cell are non-axially symmetrical about the center line of the cutting area, or the insulating protective film on the first sub-cell and the insulating protective film on the second sub-cell are non-centrally symmetrical about the center of the cutting area. This allows the solar cell to be quickly distinguished from the first sub-cell and the second sub-cell based on the difference in the pattern of the insulating protective film on the first sub-cell and the second sub-cell. This facilitates the correct connection of the first sub-cell and the second sub-cell to form a battery string, ensures the correct circuit connection of the battery module, and helps to improve the production yield and production efficiency of the battery module. Attached Figure Description

[0023] Figure 1 A side view of a solar cell provided in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of another side view of the solar cell provided in an embodiment of the present invention;

[0025] Figure 3 A front view of the first type of solar cell provided in an embodiment of this utility model;

[0026] Figure 4 A front view of the second type of solar cell provided in an embodiment of this utility model;

[0027] Figure 5 A front view of the third type of solar cell provided in this embodiment of the present utility model;

[0028] Figure 6 A front view of the fourth type of solar cell provided in this embodiment of the present utility model;

[0029] Figure 7 A front view of the fifth type of solar cell provided in this embodiment of the present invention;

[0030] Figure 8A front view of the sixth type of solar cell provided in this embodiment of the present utility model;

[0031] Figure 9 This is a front view of the seventh type of solar cell provided in this embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "backlight", "front", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] Please refer to the reference. Figures 1-3 This utility model embodiment provides a solar cell 100, comprising:

[0037] Battery body 1, comprising a first sub-battery 11 and a second sub-battery 12 arranged adjacent to each other along a first direction Y, a cutting region 13 provided between the first sub-battery 11 and the second sub-battery 12, the cutting region 13 extending along a second direction X, the second direction X intersecting the first direction Y; and

[0038] An insulating protective film 2 is provided on the front side 101 of the battery body 1, which covers the front side 101 of both the first sub-battery 11 and the second sub-battery 12. The insulating protective film 2 has a hollow area 20, and the insulating protective film 2 on the first sub-battery 11 and the insulating protective film 2 on the second sub-battery 12 are arranged non-axially symmetrically about the center line L of the cutting area 13, or the insulating protective film 2 on the first sub-battery 11 and the insulating protective film 2 on the second sub-battery 12 are arranged non-centrally symmetrically about the center of the cutting area 13.

[0039] In this embodiment of the invention, the solar cell 100 can specifically be a back-contact solar cell. The solar cell 100 includes a front side 101 and a back side 102 arranged opposite to each other. The front side 101 of the cell body 1 is the side of the solar cell 100 facing sunlight when it is working, and the back side 102 of the cell body 1 is the side of the solar cell 100 facing away from sunlight when it is working. Of course, it can also be a double-sided contact solar cell. Preferably, the second direction X is perpendicular to the first direction Y. The front side 101 of the cell body 1 includes the front side 101 of the first sub-cell 11 and the front side 101 of the second sub-cell 12. The center line L of the cutting area 13 is arranged along the second direction X. The center line L of the cutting area 13 is also the cutting line of the solar cell 100. The solar cell 100 can be cut along the center line L of the cutting area 13 to obtain the first sub-cell 11 and the second sub-cell 12.

[0040] Please refer to Figure 1 and Figure 2The solar cell 100 is a back-contact solar cell. The cell body 1 includes a silicon wafer 14. An anti-reflective film 15 is disposed on the front side of the silicon wafer 14, and an insulating protective film 2 is disposed on the anti-reflective film 15, thereby protecting the anti-reflective film 15 on the front side 101 of the solar cell 100. P-type doped layers 16 and N-type doped layers 17 are alternately disposed on the back side 102 of the silicon wafer 14. A passivation layer 10 is disposed on the P-type doped layer 16 and the N-type doped layer 17. A first electrode 18 is disposed on the P-type doped layer 16, and a second electrode 19 is disposed on the N-type doped layer 17. The first electrode 18 passes through the passivation layer 10 and contacts the P-type doped layer 16, and the second electrode 19 passes through the passivation layer 10 and contacts the N-type doped layer 17. Of course, the above is only an example of the cell body 1, and the specific structure of the cell body 1 is not limited to this, and can be various types of solar cells 100.

[0041] The solar cell 100 provided in this embodiment of the present invention protects the front surface 101 of the solar cell body 1 by setting an insulating protective film 2 on the front surface 101 of the solar cell body 1, thereby preventing the front surface 101 structure of the solar cell body 100 from being scratched during transportation or stacking and storage, greatly protecting the front surface structure of the solar cell 100 and ensuring the stability of the solar cell structure. At the same time, the solar cell body 1 is configured to include a first sub-cell 11 and a second sub-cell 12 arranged adjacent to each other along the first direction Y, which makes it easy to cut the solar cell body 1 into the first sub-cell 11 and the second sub-cell 12 along the center line L of the cutting area 13. Compared with the whole solar cell being connected in series to form a battery module, dividing the whole solar cell into the first sub-cell 11 and the second sub-cell 12 connected in series to form a battery module can reduce the power generation current of a single solar cell, reduce the internal power loss of a single solar cell, reduce the overall power loss of the battery module, and thus improve the output power of the battery module.

[0042] Furthermore, the insulating protective film 2 on the battery body 1 simultaneously covers the front faces 101 of both the first sub-cell 11 and the second sub-cell 12, ensuring that after the solar cell 100 is cut to form the first sub-cell 11 and the second sub-cell 12, the front faces 101 of both the first sub-cell 11 and the second sub-cell 12 are protected by the insulating protective film 2. The insulating protective film 2 has a perforated area 20, which specifically refers to the area on the front faces of the first sub-cell 11 and the second sub-cell 12 that is not covered by the insulating protective film 2. Alternatively, both the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 may have the perforated area 20, or only the insulating protective film 2 on the first sub-cell 11 or the insulating protective film 2 on the second sub-cell 12 may have the perforated area 20. This reduces the amount of material used in the insulating protective film 2, lowers costs, and facilitates the entry of sunlight into the battery body 1.

[0043] Specifically, the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are non-axially symmetrical about the center line L of the cutting area 13, or the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are non-centrally symmetrical about the center of the cutting area 13. That is, the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are folded and do not overlap along the center line L of the cutting area 13, or the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are rotated 180 degrees around the center of the cutting area 13 and do not overlap. This allows the solar cell 100 to quickly distinguish the first sub-cell 11 and the second sub-cell 12 based on the difference in the pattern of the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 after cutting to form the first sub-cell 11 and the second sub-cell 12. This facilitates the correct connection of the first sub-cell 11 and the second sub-cell 12 in series to form a battery string, ensures the correct circuit connection of the battery module, and helps to improve the production yield and production efficiency of the battery module.

[0044] As one embodiment of this utility model, the material of the insulating protective film 2 can be one of PVB, EVA, EPE, EP, and POE, or a laminate of at least two of PVB, EVA, EPE, EP, and POE. Specifically, PVB is polyvinyl butyral, EVA is ethylene-vinyl acetate copolymer, POE is polyolefin elastomer, EPE is EVA-POE-EVA, and EP is EVA-POE. By setting the material of the insulating protective film 2 to the above-mentioned materials, the insulating protective film 2 can have good light transmittance, ensuring good power generation efficiency of the battery, and also have good insulation properties, preventing leakage.

[0045] In this embodiment of the present invention, the insulating protective film 2 can be formed on the front side 101 of the battery body 1 by printing, spraying, or other methods.

[0046] In this embodiment of the invention, the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are arranged in a non-axially symmetrical or non-centrally symmetrical manner. Specifically, the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are arranged in a non-axially symmetrical manner about the center line L of the cutting area 13, or the insulating protective film 2 on the first sub-cell 11 and the insulating protective film 2 on the second sub-cell 12 are arranged in a non-centrally symmetrical manner about the center of the cutting area 13. That is, the pattern of the insulating protective film 2 on the front side 101 of the battery body 1 is arranged in a non-axially symmetrical or non-centrally symmetrical manner. Users can quickly distinguish between the first sub-cell 11 and the second sub-cell 12 based on the difference between the patterns of the insulating protective film 2 on the first sub-cell 11 and the second sub-cell 12. In other words, after the solar cell 100 is cut to form the first sub-cell 11 and the second sub-cell 12, the patterns of the insulating protective film 2 on the first sub-cell 11 and the second sub-cell 12 are different, and therefore the first sub-cell 11 and the second sub-cell 12 can be distinguished based on the difference in the patterns of the insulating protective film 2.

[0047] As an embodiment of the present invention, the insulating protective film 2 includes a plurality of film lines 21 arranged at intervals in sequence, and the hollow area 20 includes a gap area 200 arranged between adjacent film lines 21. The film lines 21 on the first sub-battery 11 and the film lines 21 on the second sub-battery 12 are non-axially symmetrical about the center line L of the cutting area 13, or the film lines 21 on the first sub-battery 11 and the film lines 21 on the second sub-battery 12 are non-centrally symmetrical about the center of the cutting area 13.

[0048] In this embodiment, the insulating protective film 2 on the first sub-battery 11 and the insulating protective film 2 on the second sub-battery 12 both include a plurality of film lines 21 arranged at intervals along the second direction X. Since the insulating protective film 2 on the first sub-battery 11 and the second sub-battery 12 includes a plurality of film lines 21 arranged at intervals, and the hollow area 20 includes a spacing area 200 disposed between adjacent film lines 21, the insulating protective film 2 does not completely cover the front surface 101 of the first sub-battery 11 and the second sub-battery 12, which can reduce the amount of material used in the insulating protective film 2. Under the premise that the insulating protective film 2 protects the front surface of the first sub-battery 11 and the second sub-battery 12, the production cost is reduced.

[0049] In this embodiment, by setting the membrane line 21 on the first sub-battery 11 and the membrane line 21 on the second sub-battery 12 to be non-axially symmetric or non-centrally symmetric, that is, the pattern formed by the membrane line 21 on the first sub-battery 11 and the pattern formed by the membrane line 21 on the second sub-battery 12 are different, it is convenient for users to quickly distinguish between the first sub-battery 11 and the second sub-battery 12 based on the difference between the pattern of the insulating protective film 2 on the first sub-battery 11 and the pattern of the insulating protective film 2 on the second sub-battery 12.

[0050] The different patterns of the membrane lines 21 on the first sub-cell 11 and the membrane lines 21 on the second sub-cell 12 can be achieved by the following methods: different lengths of the membrane lines 21, different widths of the membrane lines 21, different shapes of the membrane lines 21, and different widths of the spacing region 200 between the membrane lines 21. All of these methods can achieve the different patterns of the membrane lines 21 on the first sub-cell 11 and the membrane lines 21 on the second sub-cell 12.

[0051] In addition, the insulating protective film 2 on the first sub-battery 11 and the insulating protective film 2 on the second sub-battery 12 are arranged non-axially symmetrical about the center line L of the cutting area 13 or non-centrally symmetrical about the center L of the cutting area 13. Alternatively, the hollow area 20 of the insulating protective film 2 on the first sub-battery 11 and the hollow area 20 of the insulating protective film 2 on the second sub-battery 12 can be set differently, which can also make the pattern of the insulating protective film 2 on the first sub-battery 11 different from the pattern of the insulating protective film 2 on the second sub-battery 12.

[0052] Please refer to this again. Figure 3 As an embodiment of the present utility model, the hollow area 20 further includes at least one first identification area 201 disposed on the first sub-battery 11 and used for setting the identification, and at least one second identification area 202 disposed on the second sub-battery 12 and used for setting the identification.

[0053] In this embodiment, the hollowed-out area 20 specifically includes the spacing area 200 between adjacent film lines 21 on the first sub-cell 11, the spacing area 200 between adjacent film lines 21 on the second sub-cell 12, the first marking area 201 on the first sub-cell 11, and the second marking area 202 on the second sub-cell 12. At least one first marking area 201 is provided in the first sub-cell 11, and at least one second marking area 202 is provided in the second sub-cell 12. This reserves marking areas on the insulating protective films 2 of the first and second sub-cells 11 for marking, facilitating marking on the front of the first and second sub-cells 11 and enabling identification of relevant information based on the markings on the first and second sub-cells 12 during solar cell manufacturing.

[0054] In one embodiment of this utility model, the identifier is a QR code, which facilitates the setting of the identifier. The identifier corresponds to the ID information of the battery, which is beneficial for identifying relevant information of the battery cells during the battery production process. Of course, the identifier can also be text, symbols, or other patterns.

[0055] Please refer to Figures 3-6 As an embodiment of the present invention, the first marking area 201 and the second marking area 202 are arranged non-axially symmetrically about the center line L of the cutting area 13.

[0056] In this embodiment, the first marking area 201 and the second marking area 202 are arranged non-axially symmetrically about the center line L of the cutting area 13, which also makes the pattern of the insulating protective film 2 on the first sub-battery 11 different from the pattern of the insulating protective film 2 on the second sub-battery 12. The first sub-battery 11 and the second sub-battery 12 can be distinguished according to the difference between the first marking area 201 and the second marking area 202.

[0057] Please refer to Figure 3 As an embodiment of the present invention, the first marking area 201 and the second marking area 202 are staggered in the first direction Y.

[0058] In this embodiment, provided that the number and size of the first marking area 201 and the second marking area 202 are the same, the first marking area 201 and the second marking area 202 can be staggered in the first direction Y, that is, the center of the first marking area 201 and the center of the second marking area 202 are staggered in the first direction Y. Similarly, the first marking area 201 and the second marking area 202 are non-axially symmetrically arranged, so that the pattern of the insulating protective film 2 on the first sub-battery 11 is different from the pattern of the insulating protective film 2 on the second sub-battery 12. The first sub-battery 11 and the second sub-battery 12 can be distinguished according to the different positions of the first marking area 201 and the second marking area 202.

[0059] Please refer to Figure 4 As an embodiment of the present invention, the length D1 of the membrane line 21 located between the first marking area 201 and the cutting area 13 on the first sub-battery 11 is different from the length D2 of the membrane line 21 located between the second marking area 202 and the cutting area 13 on the second sub-battery 12.

[0060] In this embodiment, the first marking area 201 and the second marking area 202 have the same shape and size, which facilitates the setting of markings of the same shape and size for the first sub-battery 11 and the second sub-battery 12, and also makes it easier for the markings of the first sub-battery 11 and the second sub-battery 12 to be identified by the processing equipment in subsequent production and processing. The length D1 of the film line 21 located between the first marking area 201 and the cutting area 13 on the first sub-battery 11 is different from the length D2 of the film line 21 located between the second marking area 202 and the cutting area 13 on the second sub-battery 12. Therefore, the first sub-battery 11 and the second sub-battery 12 can be distinguished based on the difference in the length of the film line 21 between the first marking area 201 and the cutting area 13 and the second marking area 202 and the cutting area 13. This implementation method is simple and convenient for battery cell processing.

[0061] Please refer to Figure 5 As an embodiment of this utility model, the first marking area 201 and the second marking area 202 have different sizes.

[0062] In this embodiment, the first marking area 201 and the second marking area 202 have the same shape, but different sizes, resulting in different areas. This also means that the first marking area 201 and the second marking area 202 are non-axially symmetrical about the center line L of the cutting area 13. Consequently, the pattern of the insulating protective film 2 on the first sub-battery 11 is different from the pattern of the insulating protective film 2 on the second sub-battery 12. The first sub-battery 11 and the second sub-battery 12 can be distinguished based on the difference in area of ​​the first marking area 201 and the second marking area 202. For example, the width of the first marking area 201 is different from the width of the second marking area 202, and the length of the first marking area 201 is different from the length of the second marking area 202.

[0063] Please refer to Figure 6 As an embodiment of this utility model, the number of first identification areas 201 is different from the number of second identification areas 202.

[0064] In this embodiment, setting the number of the first marking area 201 and the second marking area 202 to be different also allows the first marking area 201 and the second marking area 202 to be non-axially symmetrical about the center line L of the cutting area 13. This results in the pattern of the insulating protective film 2 on the first sub-battery 11 being different from the pattern of the insulating protective film 2 on the second sub-battery 12. The first sub-battery 11 and the second sub-battery 12 can be distinguished based on the different numbers of the first marking area 201 and the second marking area 202. For example, Figure 6 The indicated first identification area 201 has 3 locations. Figure 6 The number of second identification areas 202 shown is two. In some other embodiments, the number of first identification areas 201 and the shape of second identification areas 202 can also be set differently, so that the pattern of the insulating protective film 2 on the first sub-battery 11 is different from the pattern of the insulating protective film 2 on the second sub-battery 12.

[0065] Please refer to Figures 7-9 In another embodiment of this utility model, the first marking area 201 and the second marking area 202 are arranged symmetrically about the center line L of the cutting area 13.

[0066] In this embodiment, the first marking area 201 and the second marking area 202 are arranged symmetrically about the center line L of the cutting area 13, which facilitates the setting of the first marking area 201 and the second marking area 202, and also makes it easier for the markings of the first sub-battery 11 and the second sub-battery 12 to be identified by the processing equipment in subsequent production and processing. In this embodiment, the pattern of the film line 21 on the insulating protective film 2 on the first sub-battery 11 is different from the pattern of the film line 21 on the second sub-battery 12, which can still distinguish the first sub-battery 11 and the second sub-battery 12.

[0067] Please refer to Figures 7-8 As an embodiment of the present invention, the insulating protective film 2 also includes a marking line 22 disposed in the first sub-cell 11 or the second sub-cell 12.

[0068] In this embodiment, the marking line 22 can be disposed within the first sub-cell 11 or the second sub-cell 12. By setting the marking line 22 on the insulating protective film 2 of the first sub-cell 11 or the insulating protective film 2 of the second sub-cell 12, the first sub-cell 11 and the second sub-cell 12 can be distinguished more intuitively and quickly based on whether the insulating protective film 2 contains the marking line 22. In this embodiment, the first marking area 201 and the second marking area 202 can be arranged symmetrically about the center line L of the cutting area 13, or they can be arranged non-symmetrically about the center line L of the cutting area 13.

[0069] As an embodiment of the present invention, the marking line 22 is located at the edge of the front surface 101 of the first sub-battery 11 or the edge of the front surface 101 of the second sub-battery 12.

[0070] In this embodiment, the marking line 22 is located at the edge of the front surface 101 of the first sub-battery 11 or the second sub-battery 12, making it easier to distinguish between the first sub-battery 11 and the second sub-battery 12. Preferably, the marking line 22 is located at a corner of the insulating protective film 2 of the first sub-battery 11 or the corner of the insulating protective film 2 of the second sub-battery 12. More preferably, the marking line 22 is located at two corners of the insulating protective film 2 of the first sub-battery 11. Figure 7 As shown, the marking lines 22 are located at the two corners of the insulating protective film 2 of the first sub-cell 11. Figure 8 As shown, the marking line 22 is located at a corner of the insulating protective film 2 of the first sub-cell 11.

[0071] In one embodiment of this utility model, the marking line 22 is a circular line or an oblique line, which facilitates the setting of the marking line 22. For example... Figure 7 As shown, marker line 22 is a slanted line. Figure 8As shown, marker line 22 is a circular line. Of course, marker line 22 can also be other shapes of lines.

[0072] Please refer to Figure 9 As an embodiment of the present invention, the width of at least one membrane line 21 of the first sub-cell 11 or the second sub-cell 12 is greater than the width of the other membrane lines 21.

[0073] In this embodiment, the width of one membrane line 21 of the first sub-battery 11 can be greater than the width of the other membrane lines 21 on the first sub-battery 11, and the width of one membrane line 21 of the second sub-battery 12 can be greater than the width of the other membrane lines 21 on the second sub-battery 12. This allows the pattern of the insulating protective film 2 on the first sub-battery 11 to differ from the pattern of the insulating protective film 2 on the second sub-battery 12. Users can distinguish between the first sub-battery 11 and the second sub-battery 12 based on the presence or absence of widened membrane lines 21. In this embodiment, the first marking area 201 and the second marking area 202 can be arranged symmetrically about the center line L of the cutting area 13, or they can be arranged non-symmetrically about the center line L of the cutting area 13.

[0074] Preferably, the width of the film line 21 at the edge of the first sub-cell 11 or the second sub-cell 12 is greater than the width of the other film lines 21. This can distinguish the first sub-cell 11 from the second sub-cell 12 by using the widened film line 21, and widening the film line 21 at the edge position helps to improve the wear resistance of the film line 21 at the edge position of the cell, thereby improving the protection effect of the insulating protective film 2 on the front edge of the solar cell.

[0075] This utility model embodiment also provides a battery assembly, which includes the solar cell or its slices obtained by cutting the solar cell described in the above embodiment. It should be noted that the battery assembly has the same or similar beneficial effects as the solar cell described above, and the related parts between the two can be referred to each other. To avoid repetition, they will not be described again here.

[0076] In this embodiment, multiple solar cells in the battery module can be connected in series to form a battery string, thereby achieving series current output. For example, the battery cells can be connected in series by setting solder strips (busbars, interconnecting strips), conductive backplates, etc.

[0077] It is understood that in such embodiments, the battery assembly may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film can be filled between the front and back surfaces of the solar cells, the photovoltaic glass, adjacent cells, etc. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film can be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0078] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cells while minimizing impact on their efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cells together, providing sealing, insulation, and waterproofing / moisture protection for the solar cells.

[0079] The backsheet can be attached to the encapsulating film on the back side of the solar cell. The backsheet protects and supports the solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, aluminum alloy TPT composite encapsulating film, etc., and the specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell, encapsulating film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire solar cell module, providing stable support and installation. For example, the solar cell module can be installed at the desired location using the metal frame.

[0080] This utility model embodiment also provides a photovoltaic system, which includes the battery module of the above embodiment. It should be noted that the photovoltaic system has the same or similar beneficial effects as the solar cell described above, and the related parts between the two can be referred to each other. To avoid repetition, they will not be described again here.

[0081] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple solar cell modules; for example, multiple solar cell modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0082] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A solar cell, characterized by, include: A battery body, comprising a first sub-battery and a second sub-battery arranged adjacent to each other along a first direction, a cutting region being provided between the first sub-battery and the second sub-battery, the cutting region extending along a second direction, the second direction intersecting the first direction; and An insulating protective film is disposed on the front side of the battery body, which covers the front sides of both the first sub-battery and the second sub-battery. The insulating protective film has a hollow area. The insulating protective film on the first sub-battery and the insulating protective film on the second sub-battery are arranged non-axially symmetrically about the center line of the cut area, or the insulating protective film on the first sub-battery and the insulating protective film on the second sub-battery are arranged non-centrally symmetrically about the center of the cut area.

2. The solar cell according to claim 1, characterized in that, The insulating protective film includes a plurality of film lines arranged at intervals in sequence, and the hollow area includes a spacer area between adjacent film lines. The film lines on the first sub-battery and the film lines on the second sub-battery are arranged non-axially symmetrically about the center line of the cutting area, or the film lines on the first sub-battery and the film lines on the second sub-battery are arranged non-centrally symmetrically about the center of the cutting area.

3. The solar cell according to claim 2, characterized in that, The hollowed-out area includes at least one first identification area disposed on the first sub-battery and used for setting an identification, and at least one second identification area disposed on the second sub-battery and used for setting an identification.

4. The solar cell according to claim 3, characterized in that, The identifier is a QR code.

5. The solar cell according to claim 3, characterized in that, The first marking area and the second marking area are arranged non-axially symmetrically about the center line of the cutting area.

6. The solar cell according to claim 5, characterized in that, The length of the membrane line on the first sub-cell located between the first marking area and the cutting area is different from the length of the membrane line on the second sub-cell located between the second marking area and the cutting area.

7. The solar cell according to claim 5, characterized in that, The first identification area and the second identification area have different sizes.

8. The solar cell according to claim 5, characterized in that, The first marking area and the second marking area are staggered in the first direction.

9. The solar cell according to claim 5, characterized in that, The number of the first identification area is different from the number of the second identification area.

10. The solar cell according to claim 3, characterized in that, The first marking area and the second marking area are arranged symmetrically about the center line of the cutting area.

11. The solar cell according to claim 10, characterized in that, The insulating protective film includes marking lines disposed on the first sub-cell or the second sub-cell.

12. The solar cell according to claim 11, characterized in that, The marking line is located at the edge of the front of the first sub-cell or at the edge of the front of the second sub-cell.

13. The solar cell according to claim 2, characterized in that, The width of at least one of the membrane lines in the first sub-cell or the second sub-cell is greater than the width of the remaining membrane lines.

14. A battery assembly, characterized in that, This includes solar cells as described in any one of claims 1 to 13, or segments thereof obtained by cutting them.

15. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 14.

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