Solar cell module and assembling method thereof

Abstract

The invention relates to a solar cell module and an assembling method thereof. The solar cell module comprises a plurality of cells arranged in an array; the at least one battery comprises a battery piece, at least one diode piece, an isolation adhesive film, a first connecting strip and a second connecting strip, and the diode piece is positioned on the back surface of the battery piece; the isolation adhesive film is positioned between the diode sheet and the battery sheet; the first end of the first connecting strip is electrically connected with the front welding strip of the battery piece, and the second end of the first connecting strip is electrically connected with the first electrode of one side, deviating from the battery piece, of the diode piece; the first end of the second connecting strip is electrically connected with the back welding strip of the battery piece, and the second end of the second connecting strip is electrically connected with the second electrode between the diode piece and the isolation adhesive film; the first connecting strip surrounds part of the side surface of the diode sheet and part of the side surface of the isolation glue film; the second connecting strip surrounds part of the side surface of the isolation adhesive film, and at least the event that the whole battery string cannot work normally due to the hot spot effect of individual battery pieces can be avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of photovoltaic technology, and in particular to a solar cell assembly and an assembly method thereof. Background Art

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

[0003] A battery string with hot spot effect not only fails to work properly itself, but also affects other battery strings, thus affecting the performance and service life 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 for the technical problems in the above-mentioned background technology, which can at least avoid the event that the entire battery string cannot work normally 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.

[0005] According to various embodiments of the present disclosure, the first aspect of the present disclosure provides a solar cell assembly, 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 comprises a cell sheet, at least one diode sheet, an isolation film, a first connecting strip and a second connecting strip, the cell sheet comprising a front side close to the cover plate and a back side facing away from the cover plate; at least one diode sheet is located on the back side of the cell sheet; the isolation film is located between the diode sheet and the cell sheet; a first end of the first connecting strip is electrically connected to a front welding strip of the cell sheet, and a second end of the first connecting strip is electrically connected to a first electrode on a side of the diode sheet facing away from the cell sheet; a first end of the second connecting strip is electrically connected to a back welding strip of the cell sheet, and a second end of the second connecting strip is electrically connected to a second electrode between the diode sheet and the isolation film; wherein the first connecting strip surrounds a portion of the side surface of the diode sheet and a portion of the side surface of the isolation film; and the second connecting strip surrounds a portion of the side surface of the isolation film.

[0006] In the solar cell assembly in the above embodiment, the diode chip is fixedly arranged on the back of the battery chip by an isolating adhesive film located between the diode chip and the battery chip, a first electrode of the battery chip is electrically connected to the front welding strip of the battery chip via a first connecting strip, and a second electrode of the battery chip is electrically connected to the back welding strip of the battery chip via a second connecting strip, wherein the first electrode is located on the side of the diode chip away from the battery chip, and the second electrode is located between the diode chip and the isolating adhesive film, so that the current of the battery chip with a hot spot problem can flow to the next battery chip through the diode chip connected in parallel with it, thereby preventing the battery chip with the hot spot problem from affecting other normally working battery chips, and the technical characteristics of the bypass diode connected in parallel with the battery series are improved. Compared with the technical solution of FIG. 1 , the present embodiment can at least avoid the event that the entire battery string cannot work normally 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 use efficiency of the solar cell module; and, the diode chip in the present embodiment is located on the back of the battery chip. Compared with the technical solution of the diode chip being located in the gap between adjacent battery strings, the present embodiment can not only avoid the problem of increasing the area of ​​the solar cell module due to the introduction of the diode chip, but also avoid the problem of reducing the 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.

[0007] In one of the embodiments, the isolation film includes a back side facing away from the battery cell, and at least one diode chip is located inside the back side of the isolation film, so that the surface of at least one diode chip close to the battery cell is completely adhered to the back side of the battery cell through the isolation film, thereby avoiding relative movement between the diode chip and the battery cell due to vibration or shaking, which may induce partial or complete warping of the diode chip, thereby improving the stability of adhesion between the diode chip and the battery cell, and improving the reliability and service life 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 isolation film to improve the stability of the connection between the second connecting strip and the isolation film and the second electrode of the diode chip.

[0010] In one of the embodiments, the first connecting strip covers part of the side surface of the battery cell to improve the stability of the connection between the first connecting strip and the front welding strip on the front surface of the diode cell.

[0011] In one embodiment, the second connecting bar covers a portion of the back side of the battery cell to improve the stability of the connection between the second connecting bar and the back side welding 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 welding strip electrically connected to the positive grid line; the back side of the battery cell includes a negative grid line and a back welding strip electrically connected to the negative grid line; wherein the first electrode is the cathode of the diode cell and the second electrode is the anode of the diode cell, so that the cathode of the diode cell is electrically connected to the positive grid line on the front side of the battery cell via the first connecting strip and the front welding strip, and the anode of the diode cell is electrically connected to the negative grid line on the back side of the battery cell via the second connecting strip and the back welding strip, thereby realizing parallel connection between a battery cell and at least one diode cell on its back side.

[0013] In one embodiment, the isolation adhesive film includes an insulating layer and an adhesive film, wherein the insulating layer is disposed on the surface of at least one diode chip close to the battery chip; the adhesive film is located between the insulating layer and the battery chip, and is used to glue the at least one diode chip to the battery chip. The adhesive film located between the insulating layer and the battery chip is used to glue the at least one diode chip to the back of the battery chip. Since the insulating layer is included between the diode chip and the back of the battery chip, the diode chip and the back of the battery chip are insulated from each other via the insulating layer, thereby achieving a fixed connection between the diode chip and the battery chip while avoiding ohmic contact between the diode chip and the back of the battery chip.

[0014] In one embodiment, the first connecting strip includes a bending portion located on the same side of the battery cell, the isolation film and the diode cell; the diode cell, the isolation film and the battery cell are partially located in the surrounding space of the bending portion, so that the first connecting strip can reduce the winding length and volume of the first connecting strip while electrically connecting the first electrode on the back of the diode cell and the welding strip on the front of the battery cell, and the bending portion of the first connecting strip can be used to increase the stability of the connection between the diode cell, the isolation film and the battery cell; in addition, during the process of vibration or shaking, the bending portion located on the same side of the battery cell, the isolation film and the diode cell can also play a certain buffering and shock-absorbing effect, further improving the performance and reliability of the solar cell module.

[0015] In one of the embodiments, on the cross section of the front side of the battery cell perpendicular to the cell, the side spacing between the isolation film and the diode chip ranges from 0.5mm to 1mm, ensuring that the diode chip is located within the back side of the isolation film, so that the surface of at least one diode chip close to the cell chip is completely adhered to the back side of the cell chip through the isolation film, avoiding relative movement between the diode chip and the cell chip due to vibration or shaking, thereby inducing partial or complete warping of the diode chip, improving the stability of adhesion between the diode chip and the cell chip, and improving the reliability and service life of the solar cell module.

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

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

[0018] Providing a cover plate, the cover plate comprising a front side and a back side facing away from each other; the back side of the cover plate comprises a front adhesive film;

[0019] A plurality of batteries arranged in an array are formed on the front adhesive film, at least one of the plurality of batteries comprises a battery cell, at least one diode cell, an isolation adhesive film, a first connecting strip and a second connecting strip, the battery cell comprises a front side close to the cover plate and a back side away from the cover plate; at least one diode cell is located on the back side of the battery cell; the isolation adhesive film is located between the diode cell and the battery cell; the first end of the first connecting strip is electrically connected to the front welding strip of the battery cell, and the second end is electrically connected to the first electrode of the diode cell away from the battery cell; the first end of the second connecting strip is electrically connected to the back welding strip of the battery cell, and the second end is electrically connected to the second electrode between the diode cell and the isolation adhesive film; the first connecting strip surrounds part of the side surface of the diode cell and part of the side surface of the isolation adhesive film; the second connecting strip surrounds part of the side surface of the isolation adhesive film; the diode cell is adjacent to the back adhesive film;

[0020] Providing a back plate, wherein a surface of the back plate close to the plurality of batteries comprises a back adhesive film;

[0021] The laminated cover plate, the front adhesive film, the plurality of batteries, the back adhesive film, and the back plate at least allow the battery sheet of the battery to be glued to at least one diode sheet via the isolation adhesive film.

[0022] In the assembly method of the solar cell assembly in the above embodiment, after the front film is set on the back of the cover plate, a plurality of cells arranged in an array are formed on the back film, at least one of the plurality of cells includes a cell sheet, at least one diode sheet, an isolation film, a first connecting strip and a second connecting strip, the cell sheet includes a front side close to the cover plate and a back side away from the cover plate; at least one diode sheet is located on the back of the cell sheet; the isolation film is located between the diode sheet and the cell sheet; the first end of the first connecting strip is electrically connected to the front welding strip of the cell sheet, and the second end is electrically connected to the first electrode of the diode sheet away from the cell sheet; the first end of the second connecting strip is electrically connected to the back welding strip of the cell sheet, and the second end is electrically connected to the second electrode between the diode sheet and the isolation film; the first connecting strip surrounds part of the side surface of the diode sheet and part of the side surface of the isolation film; the second connecting strip surrounds part of the side surface of the isolation film; the diode sheet is adjacent to the back film; then a back plate is provided, the surface of the back plate close to the plurality of cells includes the back film, the cover plate, the front film, the plurality of cells, the back film, and the back plate are laminated, so that at least the cell sheets of the cells are connected by The isolation film is glued to at least one diode sheet, which reduces the complexity of assembling the solar cell module and ensures that the cell is glued to the diode sheet on the back of it, so that the current of the cell with a hot spot problem can flow through the diode sheet connected in parallel with it to the next cell, thereby avoiding the cell with the hot spot problem from affecting other normally operating cells. Compared with the technical solution of connecting bypass diodes in parallel with cell strings, this embodiment can at least avoid the event that the entire cell string cannot work normally due to the hot spot effect of individual cell sheets, effectively increase the output power of the solar cell module, and improve the working efficiency and use efficiency of the solar cell module; and the diode sheet in this embodiment is located on the back of the cell sheet. Compared with the technical solution that the diode sheet is located in the gap between adjacent cell 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 sheet, but also avoid the problem of reducing the light absorption efficiency due to the introduction of the diode sheet. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without creative work.

[0024] FIG1 is a schematic diagram of a longitudinal cross-sectional structure of a solar cell assembly provided in one embodiment of the present disclosure;

[0025] FIG2 is a schematic diagram of a top view of an isolation film and a diode sheet in a solar cell module provided in one embodiment of the present disclosure;

[0026] FIG3 is a schematic diagram of a longitudinal cross-sectional structure of a solar cell assembly provided in another embodiment of the present disclosure;

[0027] FIG4 is a schematic diagram of a longitudinal cross-sectional structure of a solar cell assembly provided in yet another embodiment of the present disclosure;

[0028] FIG5 is a schematic diagram of a longitudinal cross-sectional structure of a solar cell assembly provided in yet another embodiment of the present disclosure;

[0029] FIG6 is a schematic diagram of a top view structure of a solar cell assembly provided in an embodiment of the present disclosure in which a parallel diode is provided for a battery string;

[0030] FIG. 7 is a schematic diagram of a flow chart of a method for assembling a solar cell assembly provided in an embodiment of the present disclosure.

[0031] Description of reference numerals:

[0032] 101. Cover plate; 102. Front adhesive film; 103. Back plate; 104. Back adhesive film; 20. Front welding strip; 11. Battery cell; 12. Isolation adhesive film; 13. First connecting strip; 14. Second connecting strip; 15. Diode chip. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0035] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0036] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood 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 only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present invention.

[0038] A standard solar cell module is generally composed of 6 cell strings, each cell string is composed of multiple cells, the spacing between two adjacent cell strings is about 1.6 mm, the distance between two adjacent cells in the same cell string is about 0.8 mm, and the size of the cell is, for example, 156.75 mm×156.75 mm. The types of 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 Cell, Multi-busbar Cell (MBB), Busbarless Cell (0BB), etc. How to improve the efficiency of light energy absorption and conversion, as well as performance and reliability while ensuring that the area of ​​the solar cell module does not increase is one of the important research and development directions of solar cell modules.

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

[0040] Referring to FIG. 1 , in some embodiments, a solar cell assembly is provided, comprising: 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 comprises a cell sheet 11, at least one diode sheet 15, an isolation film 12, a first connecting strip 13 and a second connecting strip 14, the cell sheet 11 comprises a front side close to the cover plate 101 and a back side away from the cover plate 101; at least one diode sheet 15 is located on the back side of the cell sheet 11; the isolation film 12 is located between the diode sheet 15 and the cell sheet 11; a first end 131 of the first connecting strip 13 is connected to the cell sheet 11; The front welding strip 20 of the cell 11 is electrically connected, and the second end 132 of the first connecting strip 13 is electrically connected to the first electrode (not shown) of the diode cell 15 on the side facing away from the battery cell 11; the first end 141 of the second connecting strip 14 is electrically connected to the back welding strip (not shown) of the battery cell 11, and the second end 142 of the second connecting strip 14 is electrically connected to the second electrode (not shown) between the diode cell 15 and the isolation film 12; wherein the first connecting strip 13 surrounds part of the side surface of the diode cell 15 and part of the side surface of the isolation film 12; the second connecting strip 14 surrounds part of the side surface of the isolation film 12.

[0041] For example, please continue to refer to Figure 1. The diode chip 15 is fixedly set on the back of the battery cell 11 through the isolation film 12 located between the diode chip 15 and the battery cell 11, and the first electrode of the battery cell 11 is electrically connected to the front welding strip 20 of the battery cell 11 via the first connecting strip 13, and the second electrode of the battery cell 11 is electrically connected to the back welding strip of the battery cell 11 via the second connecting strip 14, wherein the first electrode is located on the side of the diode chip 15 away from the battery cell 11, and the second electrode is located between the diode chip 15 and the isolation film 12, so that the current of the battery cell 11 with a hot spot problem can flow to the next battery cell 11 through the diode chip 15 connected in parallel therewith, thereby preventing the battery cell 11 with the hot spot problem from affecting other battery cells 11 that are working normally Compared with the technical solution of connecting bypass diodes in parallel with battery strings, this embodiment can at least avoid the event that the entire battery string cannot work normally due to the hot spot effect of individual battery cells 11, effectively increase the output power of the solar cell module, and improve the working efficiency and use efficiency of the solar cell module; and, the diode chip 15 in this embodiment is located on the back of the battery cell 11. Compared with the technical solution that the diode chip 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 chip 15, but also avoid the problem of reducing the light absorption efficiency due to the introduction of the diode chip 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 Figure 1. In some embodiments, the first connecting bar 13 covers a portion of the back side of the diode chip 15. For example, the second end 132 of the first connecting bar 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 to improve the stability of the connection between the first connecting bar 13 and the first electrode on the back side of the diode chip 15.

[0043] Please continue to refer to Figure 1. In some embodiments, the second connecting strip 14 covers a portion of the back side of the isolation film 12. For example, the second end 142 of the second connecting strip 14 covers a portion 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 Figure 1. In some embodiments, the first connecting strip 13 includes a bending portion 133 located on the same side of the battery cell 11, the isolation film 12 and the diode cell; the diode cell, the isolation film 12 and the battery cell 11 are all partially located in the surrounding space of the bending portion 133, so that the first connecting strip 13 can reduce the winding length and volume of the first connecting strip 13 while electrically connecting the first electrode on the back of the diode cell and the welding strip 20 on the front of the battery cell 11, and can use the bending portion 133 of the first connecting strip 13 to increase the stability of the connection between the diode cell, the isolation film 12 and the battery cell 11; in addition, during the process of vibration or shaking, the bending portion 133 located on the same side of the battery cell 11, the isolation film 12 and the diode cell can also play a certain buffering and shock-absorbing effect, further improving the performance and reliability of the solar cell module.

[0045] Please refer to Figures 1 and 2. In some embodiments, the isolation film 12 includes a back side facing away from the battery cell 11, and at least one diode chip 15 is located inside the back side of the isolation film 12, so that the surface of at least one diode chip 15 close to the battery cell 11 is completely adhered to the back side of the battery cell 11 through the isolation film 12, thereby avoiding relative movement between the diode chip 15 and the battery cell 11 due to vibration or shaking, thereby inducing partial or complete warping of the diode chip 15, improving the stability of adhesion between the diode chip 15 and the battery cell 11, and improving the reliability and service life of the solar cell module.

[0046] Please continue to refer to Figures 1 and 2. In some embodiments, on the cross section of the front side of the vertical battery cell 11 of the battery, the side spacing D1 between the isolation film 12 and the diode chip 15 ranges from 0.5mm to 1mm. For example, the spacing 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 side of the isolation film 12, so that the surface of the diode chip 15 close to the battery cell 11 is completely adhered to the back side of the battery cell 11 through the isolation film 12, avoiding relative movement between the diode chip 15 and the battery cell 11 due to vibration or shaking, thereby inducing a partial or complete warping event of the diode chip 15, improving the stability of the adhesion between the diode chip 15 and the battery cell 11, and improving the reliability and service life of the solar cell module.

[0047] Please continue to refer to Figures 1 and 2. In some embodiments, the cover plate 101 may be a glass cover plate, and the back plate 103 may be a glass back plate. Of course, in other embodiments, the material of the cover plate 101 or the back plate 103 may be selected according to the actual needs of the specific application scenario, and the embodiment of the present disclosure does not specifically limit 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 a portion of the side surface of the battery cell 11. For example, the first end 131 of the first connecting strip 13 covers a portion of the side surface of the battery cell 11 and is electrically connected to the front welding strip 20 of the battery cell 11 to improve the stability of the connection between the first connecting strip 13 and the front welding strip 20 on the front of the diode chip 15, and ensure the stability of the connection between the first connecting strip 13 and the battery cell 11.

[0049] Please continue to refer to Figure 3. In some embodiments, the second connecting bar 14 covers a portion of the back side of the battery cell 11. For example, the first end 141 of the second connecting bar 14 covers a portion of the back side of the battery cell 11 and is electrically connected to the back side welding strip (not shown) of the battery cell 11 to improve the stability of the connection between the second connecting bar 14 and the back side welding 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 welding strip electrically connected to the positive grid line; the back side of the battery cell includes a negative grid line and a back welding strip electrically connected to the negative grid line; wherein the first electrode is the cathode of the diode cell, and the second electrode is the anode of the diode cell, so that the cathode of the diode cell is electrically connected to the positive grid line on the front side of the battery cell via the first connecting strip and the front welding strip, and the anode of the diode cell is electrically connected to the negative grid line on the back side of the battery cell via the second connecting strip and the back welding strip, thereby realizing the parallel connection of a battery cell and at least one diode cell on its back side.

[0051] In some embodiments, the isolation adhesive film includes an insulating layer and an adhesive film, wherein the insulating layer is disposed on the surface of at least one diode chip close to the battery chip; the adhesive film is located between the insulating layer and the battery chip, and is used to glue at least one diode chip to the battery chip. The adhesive film located between the insulating layer and the battery chip is used to glue at least one diode chip to the back of the battery chip. Since the insulating layer is included between the diode chip and the back of the battery chip, the diode chip and the back of the battery chip are insulated from each other via the insulating layer, thereby achieving a fixed connection between the diode chip and the battery chip while avoiding ohmic contact between the diode chip and the back of the battery chip.

[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 isolation film may be directly bonded between the battery cell and the diode cell by utilizing the lamination process of the assembly.

[0053] Please refer to Figure 4. In some embodiments, adjacent battery cells 11 have an overlapping portion. On the cross section of the overlapping portion perpendicular to the front of the battery cell, the side spacing D2 of adjacent battery 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 battery cells. While ensuring the light absorption efficiency of the solar cell module, the area of ​​the solar cell module is reduced, thereby further improving the light absorption efficiency and photoelectric conversion efficiency per unit area of ​​the solar cell module.

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

[0055] Please continue to refer to FIG. 5. In some embodiments, a reflective film strip 16 is provided on the front of the diode sheet 15. When sunlight irradiates the reflective film strip 16, it will be reflected on the reflective film strip 16, so that more light will be irradiated on the surface of the battery sheet 11, thereby improving the utilization rate of light, and further facilitating the improvement of the efficiency of the photovoltaic module. The reflective film strip 16 is bonded to the diode sheet 15, and the reflective film strip 16 may include an insulating layer, an EVA layer, a polyethylene terephthalate (PET) layer, and a nano-level aluminum layer. Among them, the aluminum layer is located on the upper surface of the reflective film strip 16, and the surface of the aluminum layer presents at least one of a prism, a pyramid or a pyramid, and can reflect light. The insulating layer is located on the lower surface of the reflective film strip, that is, the insulating layer is located between the reflective film strip 16 and the diode sheet 15. The specific material of the insulating layer may be an insulating resin, etc., to prevent a short circuit between the reflective film strip 16 and the diode sheet 15.

[0056] In the structure shown in FIG5 , a technical solution can also be provided in which a battery cell 11 is configured with a parallel diode cell 15. Compared with the technical solution in which the diode cell 15 is arranged on the back of the battery cell 11 in the embodiments of FIGS. 1 to 4 , the technical solution in the embodiments of FIGS. 1 to 4 is obviously beneficial for reducing the string gap between battery strings, thereby facilitating increasing the effective area of ​​the photovoltaic module, and further facilitating improving the efficiency of the photovoltaic module.

[0057] Please refer to FIG6 . In some embodiments, a parallel diode chip 15 is configured for the battery string 30. The cathode of the diode chip 15 is connected to the positive electrode of the battery string 30 via the bus bar 200, and the anode of the diode chip 15 is connected to the negative electrode of the battery string 30 via the bus bar 200. Compared with the technical solution of setting a parallel diode chip 15 on the back of each battery cell 11 in the embodiments of FIG1 to FIG4 , the technical solution in the embodiments of FIG1 to FIG4 can at least avoid the event that the entire battery string 30 cannot work normally due to the hot spot effect of individual batteries, effectively increase the output power of the solar cell module, and improve the working efficiency and use efficiency of the solar cell module; and the diode chip 15 is set on the back of the battery cell 11. Compared with the technical solution of the diode chip being 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 chip 15, but also avoid the problem of reducing the light absorption efficiency due to the introduction of the diode chip 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, the battery string includes 36-96 electrically connected battery cells. For example, the battery string may include 36, 48, 60, 72, or 96 battery cells connected in series or in parallel.

[0059] Referring to FIG. 7 , in some embodiments, a method for assembling a solar cell assembly is provided, comprising the following steps:

[0060] Step S202: providing a cover plate, the cover plate comprising a front surface and a back surface facing away from each other; the back surface of the cover plate comprises a front adhesive film;

[0061] Step S204: forming a plurality of batteries arranged in an array on the front adhesive film, wherein at least one of the plurality of batteries comprises a battery cell, at least one diode cell, an isolation adhesive film, a first connecting strip and a second connecting strip, the battery cell comprises a front side close to the cover plate and a back side away from the cover plate; at least one diode cell is located on the back side of the battery cell; the isolation adhesive film is located between the diode cell and the battery cell; the first end of the first connecting strip is electrically connected to the front welding strip of the battery cell, and the second end is electrically connected to the first electrode of the diode cell away from the battery cell; the first end of the second connecting strip is electrically connected to the back welding strip of the battery cell, and the second end is electrically connected to the second electrode between the diode cell and the isolation adhesive film; the first connecting strip surrounds part of the side surface of the diode cell and part of the side surface of the isolation adhesive film; the second connecting strip surrounds part of the side surface of the isolation adhesive film; the diode cell is adjacent to the back adhesive film;

[0062] Step S206: providing a back plate, wherein a surface of the back plate close to the plurality of batteries comprises a back adhesive film;

[0063] Step S208: laminating the cover plate, the front adhesive film, the plurality of batteries, the back adhesive film, and the back plate, so that at least the battery cell of the battery is glued to at least one diode cell via the isolation adhesive film.

[0064] For example, please continue to refer to Figure 7. After the front film is set on the back of the cover plate, a plurality of batteries arranged in an array are formed on the back film. At least one of the plurality of batteries includes a battery cell, at least one diode cell, an isolation film, a first connecting strip and a second connecting strip. The battery cell includes a front side close to the cover plate and a back side away from the cover plate; at least one diode cell is located on the back of the battery cell; the isolation film is located between the diode cell and the battery cell; the first end of the first connecting strip is electrically connected to the front welding strip of the battery cell, and the second end is electrically connected to the first electrode of the diode cell away from the battery cell; the first end of the second connecting strip is electrically connected to the back welding strip of the battery cell, and the second end is electrically connected to the second electrode between the diode cell and the isolation film; the first connecting strip surrounds part of the side surface of the diode cell and part of the side surface of the isolation film; the second connecting strip surrounds part of the side surface of the isolation film; the diode cell is adjacent to the back film; then a back plate is provided, the surface of the back plate close to the plurality of batteries includes the back film, the cover plate, the front film, the plurality of batteries, the back film, and the back plate are laminated, so that at least the battery cells of the battery are connected via the isolation film It is glued to at least one diode chip to reduce the complexity of assembling the solar cell module, while ensuring that the cell is glued to the diode chip on the back of it, so that the current of the cell with a hot spot problem can flow through the diode chip connected in parallel with it to the next cell chip, thereby avoiding the cell with the hot spot problem from affecting other normally operating cells. Compared with the technical solution of connecting bypass diodes in parallel with the cell string, this embodiment can at least avoid the event that the entire cell string cannot work normally 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 use efficiency of the solar cell module; and the diode chip in this embodiment is located on the back of the cell chip. Compared with the technical solution that the diode chip is located in the gap between adjacent cell 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 chip, but also avoid the problem of reducing the 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.

[0065] It should be understood that, although the various steps in the flowchart of Fig. 7 are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in Fig. 7 may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0066] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present disclosure can include non-volatile and / or volatile memory.

[0067] Please note that the above embodiments are for illustrative purposes only and are not meant to limit the present invention.

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

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A solar cell module, characterized in that: include: A plurality of batteries arranged in an array between the cover plate and the back plate; At least one of the plurality of batteries comprises: A battery cell, comprising a front side close to the cover plate and a back side away from the cover plate; At least one diode chip, located on the back side of the battery chip; An isolation film is located between the diode sheet and the battery sheet; A first connecting strip, a first end of which is electrically connected to the front welding strip of the battery cell, and a second end of which is electrically connected to the first electrode of the diode chip on a side away from the battery cell; A second connecting strip, a first end of which is electrically connected to the back welding strip of the battery cell, and a second end of which is electrically connected to the second electrode between the diode chip and the isolation film; Wherein, the first connecting strip surrounds part of the side surface of the diode chip and part of the side surface of the isolation film; The second connecting strip surrounds a portion of the side surface of the isolation film.

2. The solar cell assembly according to claim 1, characterized in that: The isolation 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 isolation film.

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

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

5. The solar cell assembly according to any one of claims 1 to 4, characterized in that: The front side of the battery cell includes a positive grid line and a front side welding strip electrically connected to the positive grid line; The back side of the battery cell includes a negative electrode grid line and a back side welding strip electrically connected to the negative electrode grid line; 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 assembly according to any one of claims 1 to 4, characterized in that: The isolation film comprises: An insulating layer, disposed on a surface of the at least one diode chip close to the battery chip; The adhesive film is located between the insulating layer and the battery cell and is used to glue the at least one diode cell to the battery cell.

7. The solar cell assembly according to any one of claims 1 to 4, characterized in that: The first connecting strip includes a bent portion located on the same side of the battery sheet, the isolation film and the diode sheet; The diode sheet, the isolation film and the battery sheet are all partially located in the surrounding space of the bent portion.

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

9. The solar cell assembly according to any one of claims 1 to 4, characterized in that: Adjacent battery cells have overlapping portions; On a cross section of the overlapping portion perpendicular to the front surface of the battery cell, a side spacing between adjacent battery cells ranges from 0.3 mm to 0.6 mm.

10. A method for assembling a solar cell assembly, characterized in that: The steps include: A cover plate is provided, wherein the cover plate comprises a front surface and a back surface facing away from each other; the back surface of the cover plate comprises a front adhesive film; A plurality of batteries arranged in an array are formed on the front adhesive film, at least one of the plurality of batteries comprises a battery cell, at least one diode cell, an isolation adhesive film, a first connecting strip and a second connecting strip, the battery cell comprises a front side close to the cover plate and a back side facing away from the cover plate; the at least one diode cell is located on the back side of the battery cell; the isolation adhesive film is located between the diode cell and the battery cell; the first end of the first connecting strip is electrically connected to the front welding strip of the battery cell, and the second end is electrically connected to the first electrode of the diode cell facing away from the battery cell; the first end of the second connecting strip is electrically connected to the back welding strip of the battery cell, and the second end is electrically connected to the second electrode between the diode cell and the isolation adhesive film; the first connecting strip surrounds part of the side surface of the diode cell and part of the side surface of the isolation adhesive film; the second connecting strip surrounds part of the side surface of the isolation adhesive film; The diode sheet is adjacent to the back adhesive film; Providing a back plate, wherein a surface of the back plate close to the plurality of batteries comprises 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 so that at least the battery cell of the battery is adhesively connected to the at least one diode cell via the isolation adhesive film.

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