Laminated perovskite solar cell

Abstract

The utility model belongs to the technical field of cells, and discloses a laminated perovskite solar cell, the laminated perovskite solar cell comprises two protection members, a solar cell string, liquid silica gel and a waterproof member, the two protection members are arranged at an interval, the solar cell string is installed between the two protection members, and the waterproof member is arranged between the two protection members. The liquid silica gel is coated on the surfaces of the protection pieces facing the solar cell string, the protection pieces can be adhered to the solar cell string after the liquid silica gel is cured, and the waterproof piece is clamped between the two protection pieces and surrounds the solar cell string or is included on the outer sides of the protection pieces. According to the laminated perovskite solar cell, the delamination phenomenon caused by the fact that the interface bonding strength between the electron transport layer on the upper layer of the laminated perovskite solar cell and the core perovskite layer is smaller than the stress of an adhesive film is effectively solved; and in the lamination process of the solar cell module, the lamination temperature can be reduced to weaken the high-temperature damage to the laminated perovskite cell.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a laminated perovskite solar cell. BACKGROUND

[0002] At present, laminated perovskite solar cells face a key technical problem to be solved in the component packaging process, that is, the delamination phenomenon of the electron transport layer after packaging. Specifically, the interface bonding strength between the upper electron transport layer and the core perovskite layer of the battery is insufficient, which makes the adhesive film used in the packaging process prone to produce pulling effect on the electron transport layer under long-term stress, resulting in separation of the two. This delamination problem not only directly weakens the power conversion efficiency of the battery and reduces the power generation capacity of the overall component, but also may cause the component hot spot phenomenon due to local current concentration, further aggravating the performance degradation, and seriously threatening the long-term stability and service life of the laminated perovskite solar cell component.

[0003] Therefore, developing packaging materials and technologies with stronger adaptability and smaller stress influence has become a technical problem to improve the performance of laminated perovskite solar cells. SUMMARY

[0004] The utility model discloses a laminated perovskite solar cell which effectively solves the delamination phenomenon caused by the small interface bonding strength between the upper electron transport layer and the core perovskite layer of the laminated perovskite battery piece, and can reduce the lamination temperature during the lamination process of the solar cell component to weaken the high-temperature damage to the laminated perovskite battery piece.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The utility model discloses a laminated perovskite solar cell, which comprises two protective members, two protective members are arranged at intervals, a solar cell string is installed between the two protective members, liquid silicone is coated on the surface of the protective member facing the solar cell string, and the liquid silicone can bond the protective member to the solar cell string after solidification, a waterproof member is clamped between the two protective members and surrounds the solar cell string, or the waterproof member is wrapped outside the protective member.

[0007] In some embodiments, the surface of the protective member can be divided into at least one square region, and the amount of liquid silicone corresponding to each square region satisfies the relationship y=0.025X+0.163X, where X is the side length of the square region in centimeters, and the amount of liquid silicone y is in grams. 2 +0.163X, where X is the side length of the square region in centimeters, and the amount of liquid silicone y is in grams.

[0008] In some embodiments, the thickness of the liquid silicone rubber is 0.3-0.5 mm.

[0009] In some embodiments, the thickness of the protective member is 1-3 mm.

[0010] In some embodiments, the thickness of the waterproof member sandwiched between two protective members is 1-2 mm; or:

[0011] The thickness of the waterproof member outside the protective member is 0.2-0.6 mm.

[0012] In some embodiments, the distance between the outer peripheral wall and the inner peripheral wall of the waterproof member is 5-11 mm.

[0013] In some embodiments, the protective member is a tempered glass plate.

[0014] In some embodiments, the waterproof member comprises a butyl rubber layer or a glass powder paste sprayed on the surface of at least one protective member facing the solar cell string; or:

[0015] The waterproof member comprises an edge sealing waterproof tape wrapped outside the protective member.

[0016] In some embodiments, the solar cell string is multiple, and the laminated perovskite solar cell further comprises: a busbar for realizing the electrical connection of multiple solar cell strings; and a junction box connected with the busbar and used for connecting with external equipment.

[0017] In some embodiments, each solar cell string comprises multiple connected solar cell pieces, multiple solder strips and a wire film, the wire film covers multiple solar cell pieces, and multiple solder strips are sandwiched between the wire film and multiple solar cell pieces to conduct multiple solar cell pieces.

[0018] The laminated perovskite solar cell has the beneficial effects that: in the actual working process, the liquid silicone is uniformly scraped on the surfaces of the two protection pieces, then the solar cell string is placed and welded, the protection piece is scraped with the liquid silicone, then the splicing treatment is carried out, and then the completed assembly is sent into a laminating machine to carry out two-stage laminating, the packaging of the solar cell string is completed, the liquid silicone is used for packaging, the assembly laminating temperature can be reduced, the high-temperature damage to the laminated perovskite cell sheet is reduced, and the delamination phenomenon caused by the fact that the interface bonding strength between the electron transport layer and the core perovskite layer of the laminated perovskite cell sheet is less than the film stress is effectively solved, and the laminating temperature can be reduced in the laminating process of the solar cell assembly to weaken the high-temperature damage to the laminated perovskite cell sheet. The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure section schematic view of the laminated perovskite solar cell of the present application embodiment one;

[0020] Figure 2 is a structure schematic view of the laminated perovskite solar cell of the present application embodiment one;

[0021] Figure 3 is a top view of the solar cell string of the present application embodiment one;

[0022] Figure 4 is a plan view of the solar cell string of the present application embodiment one;

[0023] Figure 5 is a structure section schematic view of the solar cell string of the present application embodiment two.

[0024] REFERENCE NUMERALS:

[0025] 100, protection piece; 200, solar cell string; 210, solar cell sheet; 220, solder strip; 230, wire film; 300, liquid silicone; 400, waterproof piece; 500, busbar; 600, junction box. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0027] In the description of the utility model, unless there is definite and limited provision and limitation, the terms "connection", "connect", "fix" should be understood in broad sense, for example, it can be fixed connection, or it can be detachable connection, or it can be integrated, it can be mechanical connection, or it can be electrical connection, it can be direct connection, or it can be indirect connection through intermediate medium, or it can be the communication or interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0028] In the description of the embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification of operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0029] Embodiment one:

[0030] The utility model discloses a kind of laminated perovskite solar cells, refer to Figure 1 As shown, laminated perovskite solar cell includes two protective pieces 100, solar cell string 200, liquid silicone 300 and waterproof piece 400, two protective pieces 100 are arranged at intervals, solar cell string 200 is installed between two protective pieces 100, liquid silicone 300 is coated on the surface of protective piece 100 towards solar cell string 200, and after solidification, liquid silicone 300 can be bonded to solar cell string 200 with protective piece 100, waterproof piece 400 is clamped between two protective pieces 100 and surrounds solar cell string 200. It can be understood that, in actual working process, liquid silicone 300 is evenly scraped on the surface of two protective pieces 100, then solar cell string 200 is laid out and welded, protective piece 100 is scraped with liquid silicone 300 and then piece processing is carried out, then the complete assembly is sent into laminating machine for two-stage lamination, the packaging of solar cell string 200 is completed, the packaging is carried out using liquid silicone 300, effectively solve the delamination phenomenon caused by that the interface bonding strength between the upper layer electron transport layer of laminated perovskite cell sheet and core perovskite layer is less than the stress of adhesive film, and the laminated temperature can be reduced during the laminating process of the solar cell assembly to weaken the high-temperature damage to laminated perovskite cell sheet.

[0031] In some embodiments, the surface of protective piece 100 can be divided into at least one square area, and the amount of liquid silicone 300 corresponding to each square area satisfies the relationship: y=0.025X 2+0.163X, X is the side length of the square area, and the unit is centimeter, and the amount of liquid silicone 300 is in gram. It can be understood that in the actual work process, too little amount of liquid silicone 300 will lead to unstable bonding between the protective piece 100 and the solar cell string 200 and bubbles are prone to exist between them, and too much amount of liquid silicone 300 will lead to waste of raw materials and is prone to cause overflow of the liquid silicone 300 during lamination. In the embodiment, by dividing the surface of the protective piece 100 into at least one square area, the amount of liquid silicone 300 is determined according to the size of the square area, which can ensure that the amount of liquid silicone 300 is moderate, can ensure stable bonding between the protective piece 100 and the solar cell string 200 and avoid bubbles between them, and can also avoid the liquid silicone 300 from penetrating and overflowing at the edge glass and butyl rubber pasting place during lamination. Specifically, for a common 210 size perovskite solar cell, that is, a perovskite solar cell with a length and width of 210 mm, the amount of liquid silicone 300 that needs to be coated on a single protective piece 100 during packaging is 1246.86 grams. Other size components can use the above equation to calculate the gram weight of the liquid silicone 300.

[0032] In some embodiments, the thickness of the liquid silicone 300 is 0.3-0.5 mm. Specifically, the thickness of the liquid silicone 300 can be 0.3 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, 0.5 mm. Of course, the thickness of the liquid silicone 300 can also be selected as other values within the range of 0.3-0.5 mm according to actual needs, and is not limited to the above examples. It can be understood that in the actual work process, too small thickness of the liquid silicone 300 will lead to unstable bonding between the protective piece 100 and the solar cell string 200 and bubbles are prone to exist between them, and too large thickness of the liquid silicone 300 will lead to waste of raw materials and is prone to cause overflow of the liquid silicone 300 during lamination. In the embodiment, the thickness of the liquid silicone 300 is controlled within the range of 0.3-0.5 mm, which can ensure stable bonding between the protective piece 100 and the solar cell string 200 and avoid bubbles between them, and can also avoid overflow of the liquid silicone 300 during lamination and avoid material waste.

[0033] Optionally, the coefficient of thermal expansion and cold shrinkage of the liquid silicone is less than 0.0004 L / LoC. The liquid silicone packaging can reduce the stress after lamination and reduce the lamination temperature, thereby reducing the damage to the solar cell.

[0034] In some embodiments, the thickness of the protective member 100 is 1-3 mm. Specifically, the thickness of the protective member 100 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, or 3 mm. Of course, the thickness of the protective member 100 can also be selected as other values within the range of 1-3 mm according to actual needs, and is not limited to the above examples. It can be understood that too small thickness of the protective member 100 will result in insufficient protection of the solar cell string 200, and too large thickness of the protective member 100 will result in heavy weight of the entire laminated perovskite solar cell, reducing the user experience. In the present embodiment, the thickness of the protective member 100 is controlled within the range of 1-3 mm, which can ensure the protection of the solar cell string 200 and control the weight of the entire laminated perovskite solar cell, improving the user experience.

[0035] In some embodiments, the thickness of the waterproof member 400 is 1-2 mm. Specifically, the thickness of the waterproof member 400 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, or 2 mm. Of course, the thickness of the waterproof member 400 can also be selected as other values within the range of 1-2 mm according to actual needs, and is not limited to the above examples. It can be understood that the waterproof member 400 is arranged around the solar cell string 200 to avoid external water vapor from entering. Too large thickness of the waterproof member 400 will affect the bonding effect of the solar cell string 200 and the liquid silicone 300, increasing the risk of delamination, and too small thickness of the waterproof member 400 will result in reduced waterproof and dustproof capability. In the present embodiment, the thickness of the waterproof member 400 is controlled within the range of 1-2 mm, which will not affect the bonding effect of the solar cell string 200 and the liquid silicone 300, and can ensure the waterproof and dustproof capability, and has a good protective effect on the solar cell string 200.

[0036] In some embodiments, the spacing between the outer peripheral wall and the inner peripheral wall of the waterproof member 400 is 5-11 mm. The width of the waterproof member 400 can be 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, 7 mm, 7.1 mm, 7.2 mm, 7.3 mm, 7.4 mm, 7.5 mm, 7.6 mm, 7.7 mm, 7.8 mm, 7.9 mm, 8.1 mm, 8.2 mm, 8.3 mm, 8.4 mm, 8.5 mm, 8.6 mm, 8.7 mm, 8.8 mm, 8.9 mm, 9 mm, 9.1 mm, 9.2 mm, 9.3 mm, 9.4 mm, 9.5 mm, 9.6 mm, 9.7 mm, 9.8 mm, 9.9 mm, 10.1 mm, 10.2 mm, 10.3 mm, 10.4 mm, 10.5 mm, 10.6 mm, 10.7 mm, 10.8 mm, 10.9 mm, 11 mm. Of course, the width of the waterproof member 400 can also be selected as other values in the range of 5-11 mm according to actual needs, and is not limited to the above examples. It can be understood that the width of the waterproof member 400 is too large, which leads to the useless width of the entire stacked perovskite solar cell being too large, and the width of the waterproof member 400 is too small, which affects the waterproof and dustproof performance. In the present embodiment, the width of the waterproof member 400 is controlled to be between 5-11 mm, which can control the useless width of the stacked perovskite solar cell, improve the effective area, and also ensure the waterproof and dustproof ability, which has a good protection effect on the solar cell string 200.

[0037] In some embodiments, the protective member 100 is a tempered glass plate. In this way, it can play a good protection role and will not affect the normal absorption of light energy of the solar cell string 200. Of course, in other embodiments of the present application, the protective member 100 can also be selected according to actual needs.

[0038] In some embodiments, the waterproof member 400 includes a butyl rubber layer or glass powder slurry sprayed on the surface of at least one protective member 100 facing the solar cell string 200. The butyl rubber layer formed by spraying is used in the waterproof member 400, which is convenient for assembly on the one hand, and the waterproof and dustproof performance of the butyl rubber layer is good on the other hand. Of course, in the present embodiment, the material of the waterproof member 400 can also be selected according to actual needs.

[0039] In some embodiments, with reference to Figure 2As shown, the solar cell strings 200 are multiple, and the laminated perovskite solar cell further comprises a busbar 500 and a junction box 600, the busbar 500 is used to realize the electrical connection of multiple solar cell strings 200, and the junction box 600 is connected with the busbar 500 and is used to be connected with external equipment. It can be understood that the laminated perovskite solar cell composed of multiple solar cell strings 200 can improve the capacity of the laminated perovskite solar cell and improve user satisfaction, the electrical connection between multiple solar cell strings 200 can be facilitated through the busbar 500, and the added junction box 600 can facilitate the lead-out of the laminated perovskite solar cell.

[0040] In some specific embodiments, each solar cell string 200 forms a rectangle, and multiple solar cell strings 200 are arranged in multiple rows and multiple columns along the width direction and the length direction thereof. It can be understood that the arrangement of multiple solar cell strings 200 in multiple rows and multiple columns along the width direction and the length direction thereof can facilitate the assembly of the laminated perovskite solar cell.

[0041] Optionally, referring to Figures 3-4 As shown, each solar cell string 200 comprises multiple connected solar cell pieces 210, multiple solder strips 220 and a wire film 230, the wire film 230 covers the multiple solar cell pieces 210, and the multiple solder strips 220 are clamped between the wire film 230 and the multiple solar cell pieces 210 to conduct the multiple solar cell pieces 210. It can be understood that the multiple solar cell pieces 210 and the multiple solder strips 220 are arranged in sequence and then form the wire film 230 on the surface by the coating method to complete the string assembly of the multiple solar cell pieces 210, which can facilitate the string assembly of the multiple solar cell pieces 210 and also play a protective role for the multiple solar cell pieces 210.

[0042] One of the manufacturing processes of the laminated perovskite solar cell of the embodiment is as follows:

[0043] First, butyl glue is sprayed around the tempered glass plate to enhance the water resistance;

[0044] Second, liquid silicone 300 is uniformly scraped on the surface of the two tempered glass plates, and then the layout and welding of the solar cell string 200 are performed. It should be noted that the solar cell string 200 applicable to the embodiment is a laminated perovskite cell;

[0045] Third, the tempered glass plate is scraped with liquid silicone 300 and then subjected to a lamination process;

[0046] Fourth: the finished assembly into the laminator for two-stage lamination. Here need to note that, due to perovskite solar cell is not high temperature, laminator one-stage temperature setting is 70 degrees Celsius, vacuum time is 480s, laminating time is 480s, two-stage lamination temperature setting is 120 degrees Celsius, vacuum time is 360s, laminating time is 600s. One-stage lamination low temperature vacuum to ensure that the assembly in the middle of the bubble in the liquid silicone 300 has not started to cure when the bubble is discharged, two-stage lamination makes the liquid silicone 300 completely cured and bonded. One-stage and two-stage lamination process specific vacuum and laminating time according to different manufacturers laminator experimental determination.

[0047] Fifth: the assembly after lamination for the installation of junction box 600, complete assembly.

[0048] Example two:

[0049] The structure of the laminated perovskite solar cell of the present embodiment is substantially the same as that of example one, except that the structure of the waterproof member 400, as shown in Figure 5 The waterproof member 400 of the present embodiment is wrapped outside the two protective members 100, and the waterproof member 400 includes an edge sealing waterproof tape wrapped outside the protective member 100, and the thickness is 0.2mm-0.6mm. Optionally, the edge sealing waterproof tape can be an aluminum foil tape or a waterproof tape of other material.

[0050] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Obviously, the above embodiments of the present application are only for clear illustration of the present application, and are not a limitation on the embodiments of the present application. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the scope of the present application. Here it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A tandem perovskite solar cell, characterized in that, include: Two protective elements (100) are provided at intervals; A solar cell string (200) is installed between two of the protective members (100); Liquid silicone (300) is applied to the surface of the protective member (100) facing the solar cell string (200), and the liquid silicone (300) can bond the protective member (100) to the solar cell string (200) after curing. A waterproof component (400) is sandwiched between two of the protective components (100) and surrounds the solar cell string (200); or, the waterproof component (400) is wrapped around the outside of the two protective components (100).

2. The tandem perovskite solar cell according to claim 1, characterized in that, The surface of the protective element (100) can be divided into at least one square region, and the amount of liquid silicone (300) corresponding to each square region satisfies the relationship: y = 0.025X 2 +0.163X, where X is the side length of the square region in centimeters, and the amount y of the liquid silicone (300) is in grams.

3. The tandem perovskite solar cell according to claim 1, characterized in that, The thickness of the liquid silicone (300) is 0.3mm-0.5mm.

4. The tandem perovskite solar cell according to claim 1, characterized in that, The thickness of the protective component (100) is 1mm-3mm.

5. The tandem perovskite solar cell according to claim 1, characterized in that, The thickness of the waterproof component (400) sandwiched between the two protective components (100) is 1mm-2mm; or, the thickness of the waterproof component (400) wrapped around the outside of the protective component (100) is 0.2mm-0.6mm.

6. The tandem perovskite solar cell according to claim 1, characterized in that, The distance between the outer and inner peripheral walls of the waterproof component (400) is 5mm-11mm.

7. The tandem perovskite solar cell according to claim 1, characterized in that, The protective component (100) is a tempered glass plate.

8. The tandem perovskite solar cell according to claim 1, characterized in that, The waterproof component (400) includes a butyl rubber layer or glass powder paste sprayed onto the surface of at least one of the protective components (100) facing the solar cell string (200); Alternatively, the waterproof component (400) may include edge-sealing waterproof tape wrapped around the outside of the protective component (100).

9. The tandem perovskite solar cell according to claim 1, characterized in that, The solar cell strings (200) are multiple, and the tandem perovskite solar cells further include: Busbar (500) for electrically connecting multiple solar cell strings (200); Junction box (600), which is connected to the busbar (500) and is used to connect to external devices.

10. The tandem perovskite solar cell according to claim 1, characterized in that, Each of the solar cell strings (200) includes a plurality of interconnected solar cells (210), a plurality of solder ribbons (220), and a wire film (230). The wire film (230) covers the plurality of solar cells (210), and the plurality of solder ribbons (220) are sandwiched between the wire film (230) and the plurality of solar cells (210) to conduct electricity between the plurality of solar cells (210).

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