CN208240702U - Solar cell module - Google Patents

Abstract

The utility model provides a kind of solar cell module comprising battery strings.Each battery strings include the welding of several cell pieces and connection adjacent cell piece.The welding includes first part, second part and the interconnecting piece for connecting first part and second part.The first part is connected in adjacent cell piece on the light-receiving surface of one of them, second part is connected in adjacent cell piece on another one shady face and has the flat contact surface being connected with the shady face, the maximum width of the welding first part is less than the width of contact surface that second part is connect with shady face, can reduce component front with this and block, ensures that welding pulling force between welding and cell piece.

Description

solar cell module

technical field

The utility model relates to the technical field of photovoltaic power generation, in particular to a solar cell assembly.

Background technique

In traditional photovoltaic modules, the cells are connected to each other by ribbons, so that one end of the ribbon is connected to the front electrode of the cell, and the other end is connected to the back electrode of the adjacent cell, thereby forming a series array of cells. However, the conventional ribbon itself has a certain width, which will cover a part of the light-receiving area of the cell, thereby affecting the utilization of light; if the ribbon is made narrow, it will cause welding tension between the ribbon and the cell Small, there is a certain proportion of reliability risk.

Therefore, it is necessary to improve the prior art to solve the above problems.

Utility model content

The purpose of the utility model is to provide a solar battery module which can reduce the frontal shielding of the module and ensure the welding tension between the welding strip and the battery sheet.

In order to achieve the purpose of the above utility model, the utility model provides a solar cell assembly, including battery strings, each battery string includes a number of battery slices and welding strips connecting adjacent battery pieces, and the welding strips include a first part, a second part and the connection part connecting the first part and the second part; the first part is connected to the light-receiving surface of one of the adjacent battery sheets, and the second part is connected to the backlight surface of the other adjacent battery sheet and has On the planar contact surface connected to the backlight surface, the maximum width of the first part of the solder strip is smaller than the width of the contact surface of the second part connected to the backlight surface.

As a further improvement of the present invention, in the thickness direction of the battery sheet, the width of the light-receiving side of the first part of the solder ribbon gradually increases from top to bottom.

As a further improvement of the present invention, the cross section of the first part of the welding strip is circular, oval, semicircular, triangular or trapezoidal.

As a further improvement of the utility model, the cross-section of the second part of the welding strip is arranged in a rectangular shape.

As a further improvement of the present invention, the connecting portion is located between two adjacent battery sheets, and the size of the connecting portion in the thickness direction of the battery sheet is the same as the thickness of the battery sheet.

As a further improvement of the utility model, the cross-sectional shape of the connecting part gradually transitions from the cross-sectional shape of the first part to the cross-sectional shape of the second part, and the cross-sectional shape of the first part, the connecting part and the second part of the welding strip The cross-sectional area is the same.

As a further improvement of the utility model, the first part, the connecting part and the second part of the welding strip are connected together by welding, and the shapes of the end surfaces at both ends of the connecting part correspond to the cross-sectional shapes of the first part and the second part respectively.

As a further improvement of the present invention, the first part of the welding ribbon is semicircular, circular or elliptical, and a light-receiving surface of the first part is formed with microstructures that reflect light.

As a further improvement of the present invention, the microstructure is oblique stripes, and the inclination angle of the oblique stripes is not greater than 120° compared to the extending direction of the welding ribbon.

As a further improvement of the utility model, the diameter of the first part of the welding ribbon is 0.32-0.40mm, and the battery strings are arranged in parallel, and the distance between adjacent battery slices in the same battery string is 2-3mm. The distance between adjacent battery strings is 2~3mm.

The beneficial effects of the utility model are: make the welding strip and the light-receiving surface of the cell form a line or small-area contact connection; reduce the shielding of the light-receiving surface, ensure the light-receiving area, improve the light utilization rate, and then improve the conversion efficiency; and the second A relatively wide surface contact is used between the part and the backlight of the cell to ensure the contact area between the ribbon and the cell, thereby ensuring the welding tension between the ribbon and the cell, and ultimately ensuring the reliability of the solar cell module.

Description of drawings

Fig. 1 is a schematic diagram of the connection between adjacent battery sheets and welding strips in the solar cell module of the present invention.

Fig. 2 is a front view of the solar cell module shown in Fig. 1 .

Fig. 3 is a side view of the solar cell module shown in Fig. 1 .

FIG. 4 is a schematic perspective view of the welding ribbon in FIG. 1 .

Fig. 5 is a partial structural schematic diagram of the first part of the welding strip with diagonal stripes in the present invention.

FIG. 6 is a schematic diagram of light incidence and reflection when the ribbon is connected to the cell in FIG. 5 .

specific embodiment

The utility model will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and any structural or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present utility model.

Please refer to Fig. 1 to Fig. 4 together, the utility model provides a solar cell module. The solar cell module 100 includes a tempered glass panel, a transparent encapsulation film, several battery strings arranged in parallel, an encapsulation film and a back plate arranged sequentially from top to bottom. The battery string includes several battery slices 1 and welding strips 2 connecting adjacent battery slices 1 in series.

The battery sheet 1 has a light-receiving surface 11 and a backlight surface 12, and its side length is 156-166 mm. In the present utility model, the battery sheet 1 is a multi-busbar battery sheet. Specifically, in this embodiment, the light-receiving surface 11 and the backlight surface 12 of each battery sheet 1 are respectively provided with nine busbars 14 arranged in parallel. .

One of the main grids 14 is located on the centerline of the battery slice 1 . The distance between the busbars 14 adjacent to the side of the battery slice 1 and the corresponding side of the battery slice 1 is smaller than the distance between two adjacent busbars 14 . Specifically, the distance between two adjacent main grids 14 is consistent and the distance between adjacent main grids 14 is set to 16.5-19 mm; The distance between the corresponding sides is set to be 10-16 mm.

Each battery string is formed by 6-12 multi-busbar battery slices 1 connected in series, the distance between adjacent battery slices 1 in the same battery string is 2-3 mm, and the distance between adjacent battery strings is 2-3 mm.

As shown in FIGS. 1 to 4, the welding strip 2 has a first part 21, a second part 23 connected in sequence, and a connecting part 22 connecting the first part 21 and the second part 23; wherein, the first part 21 is connected to the On the light-receiving surface 11 of one of the adjacent battery sheets 1, the second part 23 is connected to the backlight surface 12 of the other adjacent battery sheet 1, and has a planar contact surface connected to the backlight surface 12 231. In the present invention, the maximum width of the first part 21 of the soldering strip 2 is smaller than the width of the contact surface 231 connecting the second part 23 with the backlight surface 12 .

As a result, the welding ribbon 2 and the light-receiving surface 11 of the battery sheet 1 can be connected in a line or in a small area; the shielding of the light-receiving surface 11 is reduced, the light-receiving area is ensured, the light utilization rate is improved, and the conversion efficiency is improved; and the second A relatively wide surface contact is adopted between the part 23 and the backlight surface 12 of the battery sheet 1 to ensure the contact area between the ribbon 2 and the battery sheet 1, thereby ensuring the welding tension between the ribbon 2 and the battery sheet 1, and finally ensuring the solar cell Component 100 reliability.

Preferably, the welding ribbon 2 is arranged such that in the thickness direction of the battery sheet 1, the width of the light-receiving side of the first part 21 of the welding ribbon 2 gradually increases from top to bottom, so as to minimize the blocking of incident light , and it is convenient to set the microstructures mentioned in the following embodiments for reflecting light, so as to increase the utilization rate of incident light.

The cross-section of the first part 21 is semicircular, circular, elliptical, triangular, trapezoidal, etc., where the circular or elliptical shape includes conventional circular and elliptical shapes, and also includes similar circular shapes. Or elliptical shape, its surface may include some other depressions or protrusions, or some deformation, as long as the outer peripheral surface is roughly circular or elliptical, so that it is basically in line with the light-receiving surface 11 of the battery sheet 1 Or small-area contact connections are all included in the technical solution of the present invention.

As shown in Figures 1, 2 and 4, the cross-section of the second part 23 of the welding strip 2 in the present invention is arranged in a rectangular shape. The cross-section of the connecting portion 22 gradually transitions from the cross-sectional shape of the first portion 21 to the cross-sectional shape of the second portion 23, and makes the cross-sectional shape of the first portion 21, the connecting portion 22 and the second portion 23 of the welding strip 2 The cross-sectional area is the same, so that the stability of the welding strip 2 for current transmission can still be ensured after the shape is changed. Of course, besides the rectangular configuration, the second part 23 can also be configured in other shapes, as long as it can ensure the connection with the battery piece 1 in a surface contact manner, thereby ensuring the welding tension. Preferably, the upper and lower sides are flat. .

In the present invention, the connecting portion 22 is located between two adjacent battery slices 1 , and the size of the connecting portion 22 in the thickness direction of the battery slice 1 is the same as the thickness of the battery slice 1 . In addition, in this embodiment, the first part 21, the connecting part 22 and the second part 23 of the welding strip 2 are connected together by welding, and the end faces of the two ends of the connecting part 22 have the same shape as the first part 21 and the second part 23 respectively. Corresponding cross-sectional shape.

Further, as shown in FIG. 5 and FIG. 6 , microstructures 24 reflecting light are formed on the light-receiving surface of the first part 21 of the solder ribbon 2 . The microstructure 24 is in contact with the transparent encapsulation film, so that the incident light passes through the coated tempered glass panel and the transparent encapsulation film to the surface of the first part 21 of the solder ribbon with a circular cross section, and is reflected by the microstructure 24 to the battery sheet 1, and then The battery sheet 1 is converted into electric energy to improve the conversion efficiency of the solar battery module of the present invention.

Preferably, the microstructures 24 in the present invention are arranged as oblique stripes. In this embodiment, the circular or elliptical first part 21 is taken as an example for illustration:

Set the diameter of the first part 21 of the welding ribbon 2 as d, and the distance between the first part 21 of the welding ribbon 2 and the edge of the battery sheet 1 in the radial direction is a, and the incident angle of light θ is the distance between the plane perpendicular to the normal of the incident light and the surface of the battery sheet 1 The included angle, that is, the inclination angle of the oblique stripes along the length direction of the ribbon 2 is β, and the included angle between the reflected light and the surface of the cell 1 is α. In order to make the light incident on the surface of the first part 21 of the ribbon 2 reflect to the surface of the battery sheet 1 twice, so that the conversion of the battery sheet 1 has the maximum gain, the above d, a, θ, α and β in the present invention satisfy the following condition:

(90°－θ)+β+α=180° (1)

That is, α=90°+θ－β

tanα≥d/a (2)

That is, α=90°+θ－β≥ arctan (d/a)

β≤90°+θ－arctan (d/a)

Wherein, in the present utility model, the diameter of the first part 21 of the welding ribbon 2 is preferably set to 0.32-0.40 mm.

Assuming that the illumination time is mainly focused on θ being 30°, when θ is less than 30°, the power gain of the solar photovoltaic module of the present utility model is the largest, taking θ=30°, the diameter of the welding ribbon 2 is d=0.35mm, assuming that a is the battery Half the width of sheet 1 = 78mm, it can be obtained that when β≤120°, the utilization rate of reflected light is the highest.

A series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present utility model, and they are not intended to limit the scope of protection of the present utility model. Embodiments or changes should be included within the protection scope of the present utility model.

Claims (10)

1. a kind of solar cell module, including battery strings, each battery strings include several cell pieces and connection adjacent cell piece Welding, the welding include first part, second part and connect first part and second part interconnecting piece；Its feature Be: the first part is connected in adjacent cell piece on the light-receiving surface of one of them, and second part is connected to adjacent cell On another one shady face and with the flat contact surface being connected with the shady face, the maximum of the welding first part in piece Width is less than the width for the contact surface that second part is connect with shady face.

2. solar cell module according to claim 1, it is characterised in that: described on the thickness direction of cell piece The width of welding first part sensitive side is gradually increased from top to bottom.

3. solar cell module according to claim 2, it is characterised in that: the cross section of the welding first part is in Round or ellipse or semicircle or triangular form are trapezoidal.

4. solar cell module according to claim 1 or 3, it is characterised in that: the welding second part it is transversal Face is arranged in rectangle.

5. solar cell module according to claim 4, it is characterised in that: the connecting portion is in two neighboring battery Between piece, and size of the interconnecting piece on cell piece thickness direction is identical as the thickness of cell piece.

6. solar cell module according to claim 5, it is characterised in that: the cross-sectional shape of the interconnecting piece is from The cross-sectional shape of a part is gradually transitions the cross-sectional shape of second part, the first part of the welding, interconnecting piece and The area of the cross section of second part is identical.

7. solar cell module according to claim 5, it is characterised in that: the first part of the welding, interconnecting piece With second part by being welded together, and the end surface shape at interconnecting piece both ends respectively with first part and second part Cross sectional shape it is corresponding.

8. solar cell module according to claim 1, it is characterised in that: welding first part semicircular in shape, Round or ellipse, and the micro-structure of reflection light is formed on first part's light-receiving surface.

9. solar cell module according to claim 8, it is characterised in that: the micro-structure is inclined stripe, described oblique The tilt angle that striped compares welding extending direction is no more than 120 °.

10. solar cell module according to claim 9, it is characterised in that: the diameter of the welding first part is 0.32 ~ 0.40mm, the battery strings are arranged in parallel with several, the spacing in same battery strings between adjacent cell piece be 2 ~ 3mm, the spacing between adjacent cell string are 2 ~ 3mm.