Solar cell module with good sealing performance

Abstract

The utility model discloses a solar cell module with good sealing performance, which comprises front plate glass, a power generation layer and back plate glass, the power generation layer is provided with a plurality of sub-cells and bus bars used for connecting the sub-cells, the power generation layer is at least provided with a packaging adhesive film on the back surface, and the packaging adhesive film and the back plate glass are provided with bus bar lead-out holes I; the bus bar leading-out hole is provided with a sealing assembly which can reduce the water vapor transmission rate of the bus bar leading-out hole I by wrapping the bus bar, and the sealing assembly selects a lower sealing part arranged below the bus bar, an upper sealing part arranged above the bus bar and used for blocking the bus bar leading-out hole I, or the cooperation of the upper sealing part and the lower sealing part. The upper sealing piece is provided with a gasket part used for enlarging the sealing area and a protruding part matched with the bus bar leading-out hole I in a sealing mode, and a bus bar leading-out hole II is formed in the protruding part. According to the utility model, the upper sealing element and the lower sealing element are arranged in advance to wrap the bus bar through a lamination process subsequently, so that the bus bar lead-out hole on the glass is effectively sealed, the bus bar lead-out hole is ensured to be thoroughly isolated from water vapor, and the problem of assembly failure caused by poor sealing of the bus bar lead-out hole is avoided.

Description

Technical Field

[0001] The utility model relates to a solar cell assembly, in particular to a solar cell assembly with good sealing. Background Art

[0002] Solar cells such as copper indium gallium selenide, heterojunction, and perovskite are more sensitive to water and oxygen, and higher water tightness and air tightness requirements are put forward for the structure of solar cell modules. The structure of existing solar cell modules is generally arranged from bottom to top in sequence: front plate glass, power generation layer, back plate glass, and junction box installed on the back plate glass. The two sides of the power generation layer are fixedly connected to the front plate glass and the back plate glass through packaging films, respectively. The power generation layer includes sub-cells and bus bars for connecting the sub-cells. The back plate glass is provided with through holes for installing the bus bars. The existing solar cell modules are sealed by injecting liquid sealant from the openings of the back glass in a hole-filling manner. This sealing method has poor sealing effect, and the water vapor permeability of the liquid sealant used at the hole-filling portion does not meet the requirement of low water vapor permeability (i.e., water vapor permeability of less than 0.3 / (g / m2d 38 °C, 100 % rh, 1 mm)) for water-oxygen sensitive solar cell modules, resulting in poor busbar wrapping and poor glass bonding at the openings, which in turn causes water vapor to easily penetrate the sealing layer and enter the interior of the solar cell. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a solar cell assembly with reasonable design, simple structure, convenient operation, reduced sealing cost of busbar lead-out holes and good sealing performance in view of the deficiencies of the prior art.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A well-sealed solar cell assembly comprises a front plate glass, a power generation layer and a back plate glass arranged in sequence from bottom to top, wherein the front plate glass and the back plate glass around the solar cell assembly are sealed and connected by edge sealant; the power generation layer is provided with a plurality of sub-cells and bus bars for connecting the sub-cells, the sub-cells are arranged in an array, the sub-cells are laid flat between the front plate glass and the back plate glass, the sub-cells are provided with a packaging film at least on the back side, and the packaging film and the back plate glass are provided with bus bar lead-out holes I for the bus bars to pass through, and the characteristic is that, The bus bar lead-out hole I is provided with a sealing component which reduces the water vapor permeability of the bus bar lead-out hole I by wrapping the bus bar. The sealing component is selected from a lower seal arranged below the bus bar, an upper seal arranged above the bus bar, or a combination of the upper seal and the lower seal. The upper seal blocks the bus bar lead-out hole I from the inside or outside of the back panel glass. The upper seal is provided with a gasket portion for expanding the sealing area and a raised portion for sealing with the bus bar lead-out hole. The gasket portion is in contact with the back panel glass, and the raised portion is provided with a bus bar lead-out hole II.

[0006] The technical problem to be solved by the utility model can also be achieved through the following technical solution. The upper seal or the lower seal is preferably a butyl rubber seal or a special-shaped butyl rubber seal, and can also be a seal made of a mixture with polyisobutylene as the main component.

[0007] The technical problem to be solved by the present invention can also be achieved through the following technical solution, wherein the height of the raised portion is ±2 mm of the thickness of the back panel glass.

[0008] The technical problem to be solved by the utility model can also be achieved through the following technical solution: the surface area of ​​the upper sealing member is 1-30 times the cross-sectional area of ​​the busbar lead-out hole I.

[0009] The technical problem to be solved by the utility model can also be achieved through the following technical solution: the surface area of ​​the lower sealing member is 1-30 times the cross-sectional area of ​​the busbar lead-out hole I.

[0010] The technical problem to be solved by the present invention can also be achieved through the following technical solutions. The shapes of the upper seal gasket part and the lower seal are preferably circular or rectangular, and other shapes can also be used. The shapes of the upper seal and the lower seal include but are not limited to the above shapes.

[0011] The technical problem to be solved by the utility model can also be achieved through the following technical solution: the thickness of the gasket part of the upper seal is 0.1mm-2mm, and the thickness of the lower seal is 0.1mm-2mm.

[0012] The technical problem to be solved by the present utility model can also be achieved through the following technical scheme, in which positioning grooves cooperating with the bus bar are provided on the upper surface of the lower seal and the lower surface of the upper seal, and the depth of the positioning groove on the lower seal and the depth of the positioning groove on the upper seal can be set according to usage conditions. Preferably, the sum of the depth of the positioning groove on the lower seal and the depth of the positioning groove on the upper seal is equal to the thickness of the bus bar.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] First, by wrapping the busbar with the upper and lower seals, the water vapor permeability of the busbar lead-out hole I is improved, solving the problems of gas residue, pores, and low adhesion caused by poor wrapping of the edge sealant and the cover glass, and the busbar.

[0015] Second, the upper seal is provided with a gasket portion for expanding the sealing area and a protrusion portion for sealing with the busbar lead-out hole, which solves the problem of high water vapor permeability at the busbar hole of photovoltaic cells such as copper indium gallium selenide, heterojunction, and perovskite;

[0016] Third, the base materials of the upper sealing member and the lower sealing member are polyisobutylene rubber, butyl rubber or other mixtures with polyisobutylene as the main component.

[0017] The well-sealed solar cell assembly described in the utility model mainly solves the sealing problem of the busbar lead-out hole of the water-oxygen sensitive battery assembly (copper indium gallium selenide, heterojunction, perovskite and other battery assemblies), and reduces the water vapor transmission rate to 0.3 / (g / m 2 d 38 °C, 100 % rh, 1 mm). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a solar cell assembly provided with an upper sealing member and a lower sealing member;

[0019] Figure 2 It is a schematic diagram of the structure of a solar cell assembly in which only an upper sealing member is provided and the upper sealing member is sealed from the inner side of the back plate glass;

[0020] Figure 3 It is a schematic diagram of the structure of a solar cell assembly in which only an upper sealing member is provided and the upper sealing member is sealed from the outside of the back plate glass.

[0021] In the figure: 1-front glass, 2-power generation layer, 3-edge sealant, 4-back glass, 5-packaging mold, 6-gasket part, 7-bus bar, 8-raised part, 9-lower sealant. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] Reference Figure 1-3 A well-sealed solar cell assembly comprises a front glass plate 1, a power generation layer and a back glass plate 4 arranged in sequence from bottom to top, the front glass plate 1 and the back glass plate 4 around the power generation layer are sealed and connected by edge sealant 3; the power generation layer is provided with a plurality of sub-cells 2 and a bus bar 7 for connecting the sub-cells 2, the sub-cells 2 are laid flat in an array between the front glass plate 1 and the back glass plate 4, the sub-cells 2 are provided with a packaging film 5 at least on the back side, that is, on the front and back side of the sub-cells, or on the back side of the sub-cells, the packaging film 5 and the back glass plate 4 are correspondingly provided with a bus bar lead-out hole I for the bus bar 7 to pass through;

[0025] A sealing component is provided at the busbar lead-out hole for reducing the water vapor permeability of the busbar lead-out hole I by wrapping the busbar 7. The sealing component is selected from a lower sealing member 9 provided below the busbar 7, an upper sealing member provided above the busbar 7 for blocking the busbar lead-out hole I, or a combination of the upper sealing member and the lower sealing member 9. The upper sealing member blocks the busbar lead-out hole I from the inside or outside of the back plate glass. The upper sealing member is provided with a gasket portion 6 for expanding the sealing area and a raised portion 8 for sealing with the busbar lead-out hole I. The gasket portion 6 is attached to the back plate glass 4, that is, the gasket portion is provided between the packaging rubber strip 5 and the back plate glass 4. The gasket portion 6 cooperates with the lower sealing member 9 to wrap the busbar 7. The raised portion 8 is provided with a busbar lead-out hole II for the busbar 7 to pass through. The main components of the upper sealing member and the lower sealing member 9 are isobutylene rubber, butyl rubber or other mixtures with polyisobutylene as the main component.

[0026] The height of the raised portion 8 is the thickness of the back panel glass 4 ±2mm, the center of the through hole of the raised portion 8 is opposite to the center of the bus bar lead-out hole I, the surface area of ​​the upper sealing gasket portion 6 is 1-30 times the cross-sectional area of ​​the bus bar lead-out hole I, the thickness of the upper sealing gasket portion 6 is 0.1mm-2mm, the surface area of ​​the lower sealing member 8 is 1-30 times the cross-sectional area of ​​the bus bar lead-out hole I, the thickness of the lower sealing member 8 is 0.1mm-2mm, the shapes of the upper sealing gasket portion and the lower sealing member 8 can be circular, rectangular or other shapes, and the upper sealing member and the lower sealing member 9 can also be used separately.

[0027] Positioning grooves cooperating with the bus bar are provided on the upper surface of the lower seal 9 and the lower surface of the upper seal. The depth of the positioning groove on the lower seal and the depth of the positioning groove on the upper seal can be set according to specific circumstances. Preferably, the sum of the depth of the positioning groove on the lower seal and the depth of the positioning groove on the upper seal is equal to the thickness of the bus bar, but is not limited to the above parameters; the centers of the lower seal and the upper seal are directly opposite to the center of the bus bar lead-out hole I, and the surface areas of the lower seal and the upper seal are larger than the cross-sectional area of ​​the bus bar lead-out hole I.

[0028] The sealing component in the solar cell assembly of the utility model is composed of an upper sealing member and a lower sealing member. The material of the above sealing member can be selected from polyisobutylene rubber, butyl rubber or other mixtures with polyisobutylene as the main component. The upper sealing member is provided with a cylindrical protrusion corresponding to the thickness of the photovoltaic glass, and the height is ±2mm different from the glass thickness. A rectangular hole is processed in the center of the cylindrical protrusion for the busbar to pass through. The size of the processed hole corresponds to the size of the busbar. Usually, the processed size is -1 to 2mm different from the thickness and width of the busbar. For the convenience of installation, the upper sealing member can also be designed as a split type or an integral type. A gasket portion 6 is provided at the bottom of the cylindrical protrusion to expand the sealing area. The shape can be circular, rectangular or other shapes, the thickness is 0.1-2mm, and the area can be 1-30 times the glass hole; the thickness of the lower sealing member is 0.1-2mm, the shape can be circular, rectangular or other shapes, and the area can be 1-30 times the glass hole. The upper sealing member and the lower sealing member can also be used separately.

[0029] When the busbar 7 is installed, the solar cell assembly described in the utility model is placed at the lower part of the corresponding lead-out hole, and the upper seal is installed after the packaging film 5 is laid. The upper seal can also be directly installed in the busbar lead-out hole of the cover glass 4, and then the cover glass 4 is installed. It should be noted that when the upper seal is used, it needs to be in direct contact with the cover glass, that is, the upper seal should be placed on the upper part of the packaging film or on the outer side of the back glass and aligned with the busbar lead-out hole 1. If the upper seal is placed at the lower part of the packaging film, the opening of the packaging film needs to be 1-2 times larger than the glass hole. After the battery is assembled, it enters the laminating machine for the laminating process. After the lamination is completed, the seal completes the sealing of the busbar lead-out hole, and the solar cell flows to the next process.

[0030] The solar cell assembly described in the utility model has the following beneficial effects:

[0031] First, the busbar is sandwiched and sealed by the upper and lower seals, which can solve the sealing problem of the busbar lead-out holes of battery components (copper indium gallium selenide, heterojunction, perovskite and other battery components) that are sensitive to water and oxygen, and reduce the water vapor transmission rate to 0.3 / (g / m2d 38 °C, 100% rh, 1 mm);

[0032] Second, reduce the sealing cost (material cost, equipment cost) of the busbar lead-out hole;

[0033] Third, it is easy to operate, reduces the labor intensity of workers, and improves production efficiency;

[0034] Fourth, there is no need to add new packaging equipment or increase additional process risks, and sealing can be completed under existing process conditions.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A well-sealed solar cell assembly, comprising a front glass plate, a power generation layer and a back glass plate arranged in sequence from bottom to top, wherein the power generation layer is provided with a plurality of sub-cells and bus bars for connecting the sub-cells, the sub-cells are arranged in an array, the power generation layer is provided with a packaging film at least on the back side, and the packaging film and the back glass plate are provided with bus bar lead-out holes I for the bus bars to pass through, characterized in that: A sealing component is provided at the bus bar lead-out hole I for reducing the water vapor transmission rate of the bus bar lead-out hole I by wrapping the bus bar, the sealing component is an upper seal, a lower seal, or a combination of the upper seal and the lower seal, the upper seal is provided with a gasket portion for expanding the sealing area and a raised portion for sealing with the bus bar lead-out hole I, the gasket portion is attached to the back plate glass, and the raised portion is provided with the bus bar lead-out hole II; The upper seal is arranged on the inner side of the back panel glass above the bus bar or on the outer side of the back panel glass and in close contact with the back panel glass. The protrusion of the upper seal is installed in the bus bar lead-out hole I of the back panel glass, and the bus bar passes through the bus bar lead-out hole II of the upper seal protrusion; the lower seal is arranged below the bus bar.

2. A well-sealed solar cell assembly according to claim 1, characterized in that: The upper sealing member or the lower sealing member is a butyl rubber sealing member or a special-shaped butyl rubber sealing member.

3. A well-sealed solar cell assembly according to claim 1 or 2, characterized in that: The height of the raised portion is ±2 mm of the thickness of the back panel glass.

4. A well-sealed solar cell assembly according to claim 1 or 2, characterized in that: The surface area of ​​the upper sealing member is 1-30 times the cross-sectional area of ​​the busbar lead-out hole I.

5. A well-sealed solar cell assembly according to claim 1 or 2, characterized in that: The surface area of ​​the lower sealing member is 1-30 times the cross-sectional area of ​​the busbar lead-out hole I.

6. A well-sealed solar cell assembly according to claim 1 or 2, characterized in that: The upper seal gasket portion and the lower seal are circular or rectangular in shape.

7. A well-sealed solar cell assembly according to claim 1 or 2, characterized in that: The thickness of the gasket portion of the upper seal is 0.1 mm-2 mm, and the thickness of the lower seal is 0.1 mm-2 mm.

8. A well-sealed solar cell assembly according to claim 1, characterized in that: Positioning grooves matching with the busbars are provided on the upper surface of the lower sealing member and the lower surface of the upper sealing member.

9. A well-sealed solar cell assembly according to claim 1, characterized in that: The front plate glass and the back plate glass around the battery assembly are sealed and connected by edge sealant.

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