Solar cell module and method of assembling the same

Abstract

This disclosure relates to a solar cell module and its assembly method. The module includes multiple cells arranged in an array. At least one cell includes a cell, at least one diode, a separator film, a first connecting strip, and a second connecting strip. The diode is located on the back side of the cell. The separator film is located between the diode and the cell. A first end of the first connecting strip is electrically connected to a front solder strip of the cell, and a second end of the first connecting strip is electrically connected to a first electrode on the side of the diode facing away from the cell. A first end of the second connecting strip is electrically connected to a back solder strip of the cell, and a second end of the second connecting strip is electrically connected to a second electrode between the diode and the separator film. The first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the separator film. The second connecting strip surrounds a portion of the side surface of the separator film, which at least prevents the entire cell string from malfunctioning due to hot spot effects from individual cells.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic technology, and in particular to a solar cell module and its assembly method. Background Technology

[0002] With the rapid development of photovoltaic technology, the market has placed higher demands on the performance and reliability of photovoltaic arrays. However, in actual operation, the non-uniform irradiance caused by shading directly affects the output power of the photovoltaic array, leading to local overheating and hot spot effects.

[0003] A cell string exhibiting a hot spot effect not only malfunctions itself but also affects other cell strings, thus impacting the performance and lifespan of the entire photovoltaic module. Summary of the Invention

[0004] Based on this, it is necessary to provide a solar cell module and its assembly method to address the technical problems mentioned above, which can at least avoid the event that the entire cell string cannot work properly due to the hot spot effect of individual cells, effectively increase the output power of the solar cell module, and improve the working efficiency and utilization efficiency of the solar cell module.

[0005] According to various embodiments of the present disclosure, a first aspect of the present disclosure provides a solar cell module, comprising: a plurality of cells arranged in an array between a cover plate and a back plate; at least one of the plurality of cells includes a cell, at least one diode, a separator film, a first connecting strip, and a second connecting strip, the cell including a front side near the cover plate and a back side away from the cover plate; at least one diode is located on the back side of the cell; the separator film is located between the diode and the cell; a first end of the first connecting strip is electrically connected to a front strip of the cell, and a second end of the first connecting strip is electrically connected to a first electrode on the side of the diode away from the cell; a first end of the second connecting strip is electrically connected to a back strip of the cell, and a second end of the second connecting strip is electrically connected to a second electrode between the diode and the separator film; wherein the first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the separator film; the second connecting strip surrounds a portion of the side surface of the separator film.

[0006] In the solar cell module described in the above embodiments, the diode is fixed to the back of the cell via an insulating film located between the diode and the cell. A first electrode of the cell is electrically connected to the front solder strip of the cell via a first connecting strip, and a second electrode is electrically connected to the back solder strip of the cell via a second connecting strip. The first electrode is located on the side of the diode facing away from the cell, and the second electrode is located between the diode and the insulating film. This allows the current from the cell exhibiting hot spots to flow through the diode connected in parallel to the next cell, preventing the hot-spot cell from affecting other normally functioning cells. This technique utilizes a bypass diode connected in parallel with the cell series. Compared to other solutions, this embodiment can at least avoid the occurrence of the entire battery string failing to function properly due to the hot spot effect of individual cells, effectively increasing the output power of the solar cell module and improving its working efficiency and utilization efficiency. Furthermore, in this embodiment, the diode is located on the back of the cell, which, compared to the technical solution where the diode is located in the gap between adjacent battery strings, not only avoids the problem of increasing the area of ​​the solar cell module due to the introduction of the diode, but also avoids the problem of reduced light absorption efficiency due to the introduction of the diode. At least it can reduce the area of ​​the solar cell module while ensuring that the light absorption efficiency of the solar cell module is not reduced.

[0007] In one embodiment, the separator film includes a back side facing away from the solar cell, with at least one diode chip located inside the back side of the separator film, such that the surface of the at least one diode chip near the solar cell is completely adhered to the back side of the solar cell via the separator film. This prevents the diode chip from moving relative to the solar cell due to vibration or shaking, thus avoiding partial or complete lifting of the diode chip. This improves the stability of the adhesion between the diode chip and the solar cell, and enhances the reliability and lifespan of the solar cell module.

[0008] In one embodiment, the first connecting strip covers a portion of the back side of the diode chip to improve the stability of the connection between the first connecting strip and the first electrode on the back side of the diode chip.

[0009] In one embodiment, the second connecting strip covers a portion of the back side of the insulating film to improve the stability of the second electrode connection between the second connecting strip and the insulating film and the diode chip.

[0010] In one embodiment, the first connecting strip covers a portion of the side of the battery cell to improve the stability of the connection between the first connecting strip and the front solder strip on the front side of the diode cell.

[0011] In one embodiment, the second connecting strip covers a portion of the back side of the battery cell to improve the stability of the connection between the second connecting strip and the back solder strip on the back side of the diode cell.

[0012] In one embodiment, the front side of the battery cell includes a positive grid line and a front solder strip electrically connected to the positive grid line; the back side of the battery cell includes a negative grid line and a back solder strip electrically connected to the negative grid line; wherein, the first electrode is the cathode of the diode chip and the second electrode is the anode of the diode chip, such that the cathode of the diode chip is electrically connected to the positive grid line on the front side of the battery cell via a first connecting strip and the front solder strip, and the anode of the diode chip is electrically connected to the negative grid line on the back side of the battery cell via a second connecting strip and the back solder strip, thereby realizing the parallel connection of a battery cell with at least one diode chip on its back side.

[0013] In one embodiment, the separating film includes an insulating layer and an adhesive film. The insulating layer is disposed on the surface of at least one diode chip near the battery cell. The adhesive film is located between the insulating layer and the battery cell, and is used to bond at least one diode chip to the battery cell. By using the adhesive film located between the insulating layer and the battery cell to bond at least one diode chip to the back of the battery cell, and because an insulating layer is included between the diode chip and the back of the battery cell, the diode chip and the back of the battery cell are insulated from each other through the insulating layer. This achieves a fixed connection between the diode chip and the battery cell while preventing ohmic contact between the diode chip and the back of the battery cell.

[0014] In one embodiment, the first connecting strip includes a bent portion located on the same side as the solar cell, the separator film, and the diode chip. The diode chip, the separator film, and the solar cell are all partially located within the surrounding space of the bent portion. This allows the first connecting strip to reduce its winding length and volume while electrically connecting the first electrode on the back of the diode chip to the solder strip on the front of the solar cell. The bent portion of the first connecting strip can also increase the stability of the connection between the diode chip, the separator film, and the solar cell. In addition, during vibration or shaking, the bent portion located on the same side of the solar cell, the separator film, and the diode chip can also play a certain role in buffering and shock absorption, further improving the performance and reliability of the solar cell module.

[0015] In one embodiment, on the cross-section of the front side of the vertical cell of the battery, the distance between the separator film and the side of the diode chip ranges from 0.5mm to 1mm, ensuring that the diode chip is located inside the back side of the separator film. This allows at least one diode chip to be completely adhered to the back side of the cell via the separator film, preventing relative movement between the diode chip and the cell due to vibration or shaking, which could induce partial or complete lifting of the diode chip. This improves the stability of the adhesion between the diode chip and the cell, thereby enhancing the reliability and lifespan of the solar cell module.

[0016] In one embodiment, adjacent solar cells have an overlapping portion; on the cross-section perpendicular to the front of the solar cell in the overlapping portion, the side spacing between adjacent solar cells ranges from 0.3mm to 0.6mm, achieving partial overlap of adjacent solar cells. This reduces the area of ​​the solar cell module while ensuring the light absorption efficiency of the solar cell module, further improving the light absorption efficiency and photoelectric conversion efficiency per unit area of ​​the solar cell module.

[0017] A second aspect of this disclosure provides a method for assembling a solar cell module, comprising the following steps:

[0018] A cover plate is provided, the cover plate including a front and a back that are opposite to each other; the back of the cover plate includes the adhesive film of the front;

[0019] Multiple batteries are arranged in an array on a front-side adhesive film. At least one battery includes a battery cell, at least one diode, an adhesive film, a first connecting strip, and a second connecting strip. The battery cell includes a front side near the cover plate and a back side away from the cover plate. At least one diode is located on the back side of the battery cell. The adhesive film is located between the diode and the battery cell. A first end of the first connecting strip is electrically connected to the front side of the battery cell by a solder strip, and a second end is electrically connected to the first electrode on the side of the diode away from the battery cell. A first end of the second connecting strip is electrically connected to the back side of the battery cell by a solder strip, and a second end is electrically connected to the second electrode between the diode and the adhesive film. The first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the adhesive film. The second connecting strip surrounds a portion of the side surface of the adhesive film. The diode is adjacent to the back-side adhesive film.

[0020] A backsheet is provided, the surface of the backsheet adjacent to multiple batteries including a back adhesive film;

[0021] The laminated cover, front adhesive film, multiple batteries, back adhesive film, and backplate at least bond the battery cells to at least one diode chip via an insulating film.

[0022] In the assembly method of the solar cell module in the above embodiments, after a front adhesive film is provided on the back of a cover plate, multiple cells are formed in an array on the back adhesive film. At least one of the multiple cells includes a cell, at least one diode, a separator film, a first connecting strip, and a second connecting strip. The cell includes a front side near the cover plate and a back side away from the cover plate. At least one diode is located on the back side of the cell. The separator film is located between the diode and the cell. The first end of the first connecting strip is electrically connected to the front solder strip of the cell, and the second end is electrically connected to the first electrode on the side of the diode away from the cell. The first end of the second connecting strip is electrically connected to the back solder strip of the cell, and the second end is electrically connected to the second electrode between the diode and the separator film. The first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the separator film. The second connecting strip surrounds a portion of the side surface of the separator film. The diode is adjacent to the back adhesive film. Then, a back sheet is provided. The surface of the back sheet near the multiple cells includes the back adhesive film, a laminated cover plate, a front adhesive film, multiple cells, a back adhesive film, and a back sheet, at least such that the cells of the cells are... By bonding at least one diode chip to the insulating film, the complexity of solar cell assembly is reduced while ensuring bonding between the solar cell and the diode chip on its back. This allows the current from a solar cell with hot spots to flow through the diode chip connected in parallel to the next solar cell, thus preventing the hot-spot solar cell from affecting other normally functioning solar cells. Compared to the technical solution of parallel bypass diodes in a solar cell string, this embodiment can at least avoid the event that the entire solar cell string cannot function properly due to the hot spot effect of an individual solar cell, effectively increasing the output power of the solar cell module and improving its working efficiency and utilization efficiency. Furthermore, in this embodiment, the diode chip is located on the back of the solar cell. Compared to the technical solution where the diode chip is located in the gap between adjacent solar cell strings, this embodiment not only avoids the problem of increasing the area of ​​the solar cell module due to the introduction of the diode chip, but also avoids the problem of reduced light absorption efficiency due to the introduction of the diode chip. At least it can reduce the area of ​​the solar cell module while ensuring that the light absorption efficiency of the solar cell module is not reduced. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of a solar cell module provided in one embodiment of the present disclosure;

[0025] Figure 2This is a top view structural diagram of the insulating film and diode chip in a solar cell module provided in one embodiment of the present disclosure;

[0026] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of a solar cell module provided in another embodiment of this disclosure;

[0027] Figure 4 This is a schematic diagram of the longitudinal cross-sectional structure of a solar cell module provided in another embodiment of the present disclosure;

[0028] Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of a solar cell module provided in another embodiment of this disclosure;

[0029] Figure 6 This is a top view schematic diagram of a solar cell module in which parallel diodes are arranged in a cell string, according to an embodiment of the present disclosure.

[0030] Figure 7 This is a flowchart illustrating a method for assembling a solar cell module according to an embodiment of the present disclosure.

[0031] Explanation of reference numerals in the attached figures:

[0032] 101. Cover plate; 102. Front adhesive film; 103. Back plate; 104. Back adhesive film; 20. Front solder strip; 11. Battery cell; 12. Separating adhesive film; 13. First connecting strip; 14. Second connecting strip; 15. Diode chip. Detailed Implementation

[0033] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0035] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0036] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0038] A standard solar cell module typically consists of six cell strings, each string comprising multiple solar cells. The spacing between adjacent strings is approximately 1.6 mm, and the distance between adjacent cells within the same string is approximately 0.8 mm. The cell dimensions are, for example, 156.75 mm × 156.75 mm. Types of solar cells include, but are not limited to, Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), perovskite cells, multi-busbar (MBB) cells, and busbarless (OBB) cells. Improving the efficiency of light absorption and conversion, as well as performance and reliability, without increasing the area of ​​the solar cell module is one of the important research and development directions for solar cell modules.

[0039] To prevent hot spots from causing permanent damage to the components, bypass diodes are usually connected in reverse parallel to the battery string. Under non-uniform irradiance conditions, the most severely shaded battery string will become the load. At this time, the current flowing through the shaded battery string will bypass the current of the bypass diode, so as to effectively reduce the impact of reverse bias voltage on the hot spot battery.

[0040] Please refer to Figure 1In some embodiments, a solar cell module is provided, including: a plurality of cells arranged in an array between a cover plate 101 and a back plate 103; at least one of the plurality of cells includes a cell 11, at least one diode 15, a separator film 12, a first connecting strip 13 and a second connecting strip 14, the cell 11 including a front side near the cover plate 101 and a back side away from the cover plate 101; at least one diode 15 is located on the back side of the cell 11; the separator film 12 is located between the diode 15 and the cell 11; the first end 131 of the first connecting strip 13 is connected to the cell 11. The front solder strip 20 is electrically connected, and the second end 132 of the first connecting strip 13 is electrically connected to the first electrode (not shown) on the side of the diode chip 15 away from the battery chip 11; the first end 141 of the second connecting strip 14 is electrically connected to the back solder strip (not shown) of the battery chip 11, and the second end 142 of the second connecting strip 14 is electrically connected to the second electrode (not shown) between the diode chip 15 and the separator film 12; wherein, the first connecting strip 13 surrounds part of the side surface of the diode chip 15 and part of the side surface of the separator film 12; the second connecting strip 14 surrounds part of the side surface of the separator film 12.

[0041] For example, please continue to refer to Figure 1 The diode 15 is fixed to the back of the battery cell 11 via the insulating film 12 located between the diode 15 and the battery cell 11. The first electrode of the battery cell 11 is electrically connected to the front solder strip 20 of the battery cell 11 via a first connecting strip 13, and the second electrode of the battery cell 11 is electrically connected to the back solder strip of the battery cell 11 via a second connecting strip 14. The first electrode is located on the side of the diode 15 away from the battery cell 11, and the second electrode is located between the diode 15 and the insulating film 12. This allows the current from the battery cell 11 with hot spots to flow through the diode 15 connected in parallel to the next battery cell 11, thus preventing the battery cell 11 with hot spots from affecting other normally operating battery cells 11 and the battery string. Compared to the parallel bypass diode solution, this embodiment can at least avoid the event that the entire battery string cannot work properly due to the hot spot effect of individual battery cells 11, effectively increasing the output power of the solar cell module and improving the working efficiency and utilization efficiency of the solar cell module. Furthermore, in this embodiment, the diode 15 is located on the back of the battery cell 11. Compared to the solution where the diode is located in the gap between adjacent battery strings, this embodiment can not only avoid the problem of increasing the area of ​​the solar cell module due to the introduction of the diode 15, but also avoid the problem of reduced light absorption efficiency due to the introduction of the diode 15. At least it can reduce the area of ​​the solar cell module while ensuring that the light absorption efficiency of the solar cell module is not reduced.

[0042] Please continue to refer to this. Figure 1In some embodiments, the first connecting strip 13 covers a portion of the back side of the diode chip 15. For example, the second end 132 of the first connecting strip 13 covers a portion of the back side of the diode chip 15 and is electrically connected to the first electrode (not shown) on the side of the diode chip 15 away from the battery chip 11, so as to improve the stability of the connection between the first connecting strip 13 and the first electrode on the back side of the diode chip 15.

[0043] Please continue to refer to this. Figure 1 In some embodiments, the second connecting strip 14 covers part of the back side of the isolation film 12. For example, the second end 142 of the second connecting strip 14 covers part of the back side of the isolation film 12 and is electrically connected to the second electrode (not shown) of the diode chip 15. The second electrode of the diode chip 15 is located between the diode chip 15 and the isolation film 12 to improve the stability of the second electrode connection between the second connecting strip 14 and the isolation film 12 and the diode chip 15.

[0044] Please continue to refer to this. Figure 1 In some embodiments, the first connecting strip 13 includes a bent portion 133 located on the same side as the solar cell 11, the separator film 12, and the diode. The diode, the separator film 12, and the solar cell 11 are all partially located within the surrounding space of the bent portion 133. This allows the first connecting strip 13 to reduce its winding length and volume while electrically connecting the first electrode on the back of the diode to the solder strip 20 on the front of the solar cell 11. The bent portion 133 of the first connecting strip 13 can also increase the stability of the connection between the diode, the separator film 12, and the solar cell 11. In addition, during vibration or shaking, the bent portion 133 located on the same side of the solar cell 11, the separator film 12, and the diode can also play a certain role in buffering and shock absorption, further improving the performance and reliability of the solar cell module.

[0045] Please refer to Figures 1-2 In some embodiments, the separator film 12 includes a back side facing away from the solar cell 11, and at least one diode chip 15 is located inside the back side of the separator film 12, such that at least one diode chip 15 is completely adhered to the back side of the solar cell 11 near the surface of the solar cell 11 via the separator film 12. This avoids relative movement between the diode chip 15 and the solar cell 11 due to vibration or shaking, which could induce partial or complete lifting of the diode chip 15. This improves the stability of the adhesion between the diode chip 15 and the solar cell 11, and enhances the reliability and lifespan of the solar cell module.

[0046] Please continue to refer to this. Figures 1-2In some embodiments, on the front cross-section of the vertical cell 11 of the battery, the distance D1 between the separator film 12 and the side of the diode chip 15 ranges from 0.5mm to 1mm. For example, the distance D1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm, etc., to ensure that the diode chip 15 is located inside the back of the separator film 12, so that the surface of the diode chip 15 near the cell 11 is completely adhered to the back of the cell 11 via the separator film 12. This avoids relative movement between the diode chip 15 and the cell 11 due to vibration or shaking, which could induce partial or complete lifting of the diode chip 15, thereby improving the stability of the adhesion between the diode chip 15 and the cell 11 and improving the reliability and service life of the solar cell module.

[0047] Please continue to refer to this. Figures 1-2 In some embodiments, the cover plate 101 can be a glass cover plate, and the back plate 103 can be a glass back plate. Of course, in other embodiments, the material of the cover plate 101 or the back plate 103 can be selected according to the actual needs of the specific application scenario. This disclosure does not impose specific limitations on the material of the cover plate 101 or the back plate 103.

[0048] Please refer to Figure 3 In some embodiments, the first connecting strip 13 covers part of the side of the battery cell 11. For example, the first end 131 of the first connecting strip 13 covers part of the side of the battery cell 11 and is electrically connected to the front solder strip 20 of the battery cell 11 to improve the stability of the connection between the first connecting strip 13 and the front solder strip 20 of the diode chip 15, and to ensure the stability of the connection between the first connecting strip 13 and the battery cell 11.

[0049] Please continue to refer to this. Figure 3 In some embodiments, the second connecting strip 14 covers a portion of the back side of the battery cell 11. For example, the first end 141 of the second connecting strip 14 covers a portion of the back side of the battery cell 11 and is electrically connected to the back solder strip (not shown) of the battery cell 11 to improve the stability of the connection between the second connecting strip 14 and the back solder strip on the back side of the diode chip 15.

[0050] In some embodiments, the front side of the battery cell includes a positive grid line and a front solder strip electrically connected to the positive grid line; the back side of the battery cell includes a negative grid line and a back solder strip electrically connected to the negative grid line; wherein, the first electrode is the cathode of the diode chip and the second electrode is the anode of the diode chip, such that the cathode of the diode chip is electrically connected to the positive grid line on the front side of the battery cell via a first connecting strip and the front solder strip, and the anode of the diode chip is electrically connected to the negative grid line on the back side of the battery cell via a second connecting strip and the back solder strip, thereby realizing the parallel connection of a battery cell with at least one diode chip on its back side.

[0051] In some embodiments, the separating film includes an insulating layer and an adhesive film. The insulating layer is disposed on the surface of at least one diode chip near the battery cell. The adhesive film is located between the insulating layer and the battery cell, and is used to bond at least one diode chip to the battery cell. By using the adhesive film located between the insulating layer and the battery cell to bond at least one diode chip to the back of the battery cell, and because an insulating layer is included between the diode chip and the back of the battery cell, the diode chip and the back of the battery cell are insulated from each other through the insulating layer. This achieves a fixed connection between the diode chip and the battery cell while preventing ohmic contact between the diode chip and the back of the battery cell.

[0052] In some embodiments, the insulating layer material may include, but is not limited to, at least one of insulating resin, polyolefin elastomer (POE), pearl cotton (EPE), and ethylene-vinyl acetate copolymer (EVA). The separator film may be directly bonded between the solar cell and the diode chip using the lamination process of the component.

[0053] Please refer to Figure 4 In some embodiments, adjacent solar cells 11 have overlapping portions; on the cross-section perpendicular to the front side of the overlapping portion, the side spacing D2 of adjacent solar cells ranges from 0.3mm to 0.6mm. For example, the spacing D2 can be 0.3mm, 0.4mm, 0.5mm, or 0.6mm, etc., to achieve partial overlap of adjacent solar cells. While ensuring the light absorption efficiency of the solar cell module, the area of ​​the solar cell module is reduced, and the light absorption efficiency and photoelectric conversion efficiency per unit area of ​​the solar cell module are further improved.

[0054] Please refer to Figure 5 In some embodiments, the diode chip 15 is located in the gap between the battery strings or in the gap between adjacent battery chips 11. The width of the diode chip 15 is 0.3mm-1.5mm. For example, the width of the diode chip 15 can be 0.3mm, 0.6mm, 0.9mm, 1.2mm or 1.5mm, etc. The width of the diode chip 15 is smaller than the spacing between adjacent battery chips 11.

[0055] Please continue to refer to this. Figure 5In some embodiments, a reflective film strip 16 is provided on the front side of the diode chip 15. When sunlight shines on the reflective film strip 16, it is reflected, allowing more light to reach the surface of the solar cell 11, thereby improving light utilization and thus enhancing the efficiency of the photovoltaic module. The reflective film strip 16 is bonded to the diode chip 15. The reflective film strip 16 may include an insulating layer, an EVA layer, a polyethylene terephthalate (PET) layer, and a nano-sized aluminum layer. The aluminum layer is located on the upper surface of the reflective film strip 16, and its surface has at least one of the following shapes: prismatic, pyramidal, or conical, allowing it to reflect light. The insulating layer is located on the lower surface of the reflective film strip, i.e., between the reflective film strip 16 and the diode chip 15. The insulating layer can be made of insulating resin or similar materials to prevent short circuits between the reflective film strip 16 and the diode chip 15.

[0056] Figure 5 In the structure shown, a technical solution can also be provided where a battery cell 11 is configured with a diode cell 15 connected in parallel, compared to... Figures 1-4 In this embodiment, the diode chip 15 is disposed on the back side of the battery cell 11. Figures 1-4 The technical solution in the embodiment is obviously beneficial to reducing the gap between battery strings, thereby increasing the effective area of ​​the photovoltaic module and thus improving the efficiency of the photovoltaic module.

[0057] Please refer to Figure 6 In some embodiments, a diode 15 is configured in parallel for the battery string 30. The cathode of the diode 15 is connected to the positive terminal of the battery string 30 via a busbar 200, and the anode of the diode 15 is connected to the negative terminal of the battery string 30 via the busbar 200. Compared to Figures 1-4 In this embodiment, a technical solution is implemented where a diode chip 15 is connected in parallel on the back of each battery cell 11. Figures 1-4 The technical solution in this embodiment can at least avoid the event that the entire battery string 30 cannot work properly due to the hot spot effect of individual battery cells, effectively increase the output power of the solar cell module, and improve the working efficiency and utilization efficiency of the solar cell module. Furthermore, by placing the diode 15 on the back of the battery cell 11, compared with the technical solution where the diode is located in the gap between adjacent battery strings, this embodiment can not only avoid the problem of increasing the area of ​​the solar cell module due to the introduction of the diode 15, but also avoid the problem of reducing the light absorption efficiency due to the introduction of the diode 15. At least it can reduce the area of ​​the solar cell module while ensuring that the light absorption efficiency of the solar cell module is not reduced.

[0058] For example, a battery string comprises 36-96 electrically connected battery cells. For instance, the number of battery cells connected in series or in parallel within the battery string can be 36, 48, 60, 72, or 96, etc.

[0059] Please refer to Figure 7 In some embodiments, a method for assembling a solar cell module is provided, including the following steps:

[0060] Step S202: Provide a cover plate, the cover plate including a front and a back side facing away from each other; the back side of the cover plate includes the adhesive film of the front side;

[0061] Step S204: Form a plurality of batteries arranged in an array on the front adhesive film. At least one of the batteries includes a battery cell, at least one diode chip, an adhesive film, a first connecting strip, and a second connecting strip. The battery cell includes a front side near the cover plate and a back side away from the cover plate. At least one diode chip is located on the back side of the battery cell. The adhesive film is located between the diode chip and the battery cell. The first end of the first connecting strip is electrically connected to the front solder strip of the battery cell, and the second end is electrically connected to the first electrode on the side of the diode chip away from the battery cell. The first end of the second connecting strip is electrically connected to the back solder strip of the battery cell, and the second end is electrically connected to the second electrode between the diode chip and the adhesive film. The first connecting strip surrounds a portion of the side surface of the diode chip and a portion of the side surface of the adhesive film. The second connecting strip surrounds a portion of the side surface of the adhesive film. The diode chip is adjacent to the back adhesive film.

[0062] Step S206: Provide a backsheet, the surface of the backsheet adjacent to the plurality of batteries including a back adhesive film;

[0063] Step S208: Laminating a cover plate, a front adhesive film, multiple batteries, a back adhesive film, and a backplate, such that at least the battery cells are bonded to at least one diode chip via an insulating adhesive film.

[0064] For example, please continue to refer to Figure 7After a front adhesive film is applied to the back of a cover plate, multiple batteries are formed in an array on the back adhesive film. At least one of the batteries includes a battery cell, at least one diode, a separator film, a first connecting strip, and a second connecting strip. The battery cell includes a front side near the cover plate and a back side away from the cover plate. At least one diode is located on the back side of the battery cell. The separator film is located between the diode and the battery cell. A first end of the first connecting strip is electrically connected to the front solder strip of the battery cell, and a second end is electrically connected to the first electrode on the side of the diode away from the battery cell. A first end of the second connecting strip is electrically connected to the back solder strip of the battery cell, and a second end is electrically connected to the second electrode between the diode and the separator film. The first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the separator film. The second connecting strip surrounds a portion of the side surface of the separator film. The diode is adjacent to the back adhesive film. Then, a backplate is provided. The surface of the backplate near the multiple batteries includes the back adhesive film. The cover plate, the front adhesive film, the multiple batteries, the back adhesive film, and the backplate are laminated, such that the battery cells of the batteries are connected to at least one diode via the separator film. By bonding the cells together, the complexity of solar cell assembly is reduced, while ensuring that the cells are bonded to the diodes on their backs. This allows current from cells with hot spots to flow through the diodes connected in parallel to the next cell, preventing the hot-spotted cell from affecting other normally functioning cells. Compared to the parallel bypass diodes in the cell string, this embodiment at least avoids the event that the entire cell string cannot function properly due to the hot spot effect of individual cells, effectively increasing the output power of the solar cell module and improving its working efficiency and utilization efficiency. Furthermore, in this embodiment, the diodes are located on the back of the cells, which, compared to the technology where the diodes are located in the gaps between adjacent cell strings, not only avoids the problem of increasing the area of ​​the solar cell module due to the introduction of diodes, but also avoids the problem of reduced light absorption efficiency due to the introduction of diodes. At least it can reduce the area of ​​the solar cell module while ensuring that the light absorption efficiency of the solar cell module is not reduced.

[0065] It should be understood that, although Figure 7 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 7 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0066] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Furthermore, any references to memory, storage, databases, or other media used in the embodiments provided in this disclosure can include non-volatile and / or volatile memory.

[0067] Please note that the above embodiments are for illustrative purposes only and do not imply any limitation on the present invention.

[0068] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A solar cell module, characterized in that, include: Multiple batteries arranged in an array between the cover plate and the back plate; At least one of the plurality of batteries includes: The battery cell includes a front side near the cover plate and a back side away from the cover plate; At least one diode chip is located on the back side of the battery cell; A separating film is located between the diode chip and the battery chip; The first connecting strip has a first end electrically connected to the front welding strip of the battery cell, and a second end electrically connected to the first electrode on the side of the diode chip opposite to the battery cell. The second connecting strip has its first end electrically connected to the back of the battery cell by a welding strip, and its second end electrically connected to the second electrode between the diode chip and the insulating film. The first connecting strip surrounds a portion of the side surface of the diode chip and a portion of the side surface of the insulating film. The second connecting strip surrounds a portion of the side surface of the insulating film; The first connecting strip includes a bent portion located on the same side as the battery cell, the insulating film, and the diode cell; the diode cell, the insulating film, and the battery cell are all partially located within the surrounding space of the bent portion.

2. The solar cell module according to claim 1, characterized in that, The insulating film includes a back side facing away from the battery cell; The at least one diode chip is located inside the back side of the insulating film.

3. The solar cell module according to claim 2, characterized in that, The first connecting strip covers a portion of the back side of the diode chip; and / or The second connecting strip covers part of the back side of the insulating film.

4. The solar cell module according to claim 3, characterized in that, The first connecting strip covers a portion of the side of the battery cell; and / or The second connecting strip covers part of the back of the battery cell.

5. The solar cell module according to any one of claims 1-4, characterized in that, The front side of the battery cell includes positive grid lines and front solder strips electrically connected to the positive grid lines; The back side of the battery cell includes negative grid lines and a back solder strip electrically connected to the negative grid lines; Wherein, the first electrode is the cathode of the diode chip, and the second electrode is the anode of the diode chip.

6. The solar cell module according to any one of claims 1-4, characterized in that, The insulating film includes: An insulating layer is disposed on the surface of the at least one diode chip near the battery chip; An adhesive film, located between the insulating layer and the battery cell, is used to bond the at least one diode chip to the battery cell.

7. The solar cell module according to any one of claims 1-4, characterized in that, A reflective film strip is provided on the front side of the diode chip.

8. The solar cell module according to any one of claims 2-4, characterized in that, On a cross-section perpendicular to the front of the battery cell, the distance between the insulating film and the side of the diode cell ranges from 0.5mm to 1mm.

9. The solar cell module according to any one of claims 1-4, characterized in that, The adjacent battery cells have overlapping portions; On the cross-section perpendicular to the front of the battery cell at the overlapping portion, the lateral spacing between adjacent battery cells ranges from 0.3mm to 0.6mm.

10. A method for assembling a solar cell module, characterized in that, Includes the following steps: A cover plate is provided, the cover plate including a front side and a back side facing away from each other; the back side of the cover plate includes a film from the front side; Multiple batteries are arranged in an array on the front adhesive film. At least one of the batteries includes a battery cell, at least one diode, a separator film, a first connecting strip, and a second connecting strip. The battery cell includes a front side near the cover plate and a back side away from the cover plate. The at least one diode is located on the back side of the battery cell. The separator film is located between the diode and the battery cell. A first end of the first connecting strip is electrically connected to the front solder strip of the battery cell, and a second end is electrically connected to a first electrode on the side of the diode away from the battery cell. A first end of the second connecting strip is electrically connected to the back solder strip of the battery cell, and a second end is electrically connected to a second electrode between the diode and the separator film. The first connecting strip surrounds a portion of the side surface of the diode and a portion of the side surface of the separator film. The second connecting strip surrounds a portion of the side surface of the separator film. The diode is adjacent to the back adhesive film. The first connecting strip includes a bent portion located on the same side of the battery cell, the separator film, and the diode. The diode, the separator film, and the battery cell are all partially located within the surrounding space of the bent portion. A backsheet is provided, wherein the surface of the backsheet adjacent to the plurality of batteries includes a back adhesive film; The cover plate, the front adhesive film, the plurality of batteries, the back adhesive film, and the back plate are laminated such that at least one of the battery cells is bonded to the at least one diode chip via the insulating adhesive film.

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