Battery string and photovoltaic module

Abstract

The utility model brings forward a cell string and a photovoltaic assembly, the cell string comprises a plurality of cell sheets, a solder strip connecting adjacent cell sheets, a strip-shaped carrier film and a first glass fiber carrier film, and the solder strip comprises a first covering section, a second covering section and an exposed section. One strip-shaped carrier film is laid on the surface of the first covering section of each welding strip, a first glass fiber carrier film is laid on the surface of the second covering section of each welding strip, and the length direction of the first glass fiber carrier films is perpendicular to the length direction of the welding strips. The first glass fiber carrier film covers the plurality of welding strips on the surface of the corresponding battery piece, and the exposed section extends out of the edge of the battery piece. According to the utility model, the solder strip can be prevented from position offset in the lamination process, the occurrence of pseudo soldering conditions is reduced, and the yield of finished products can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic power generation, in particular to a cell string and a photovoltaic module. BACKGROUND

[0002] With the increasingly serious global energy crisis and environmental pollution, developing renewable clean energy has become one of the major strategic issues in the international community. Solar energy is inexhaustible and clean, and photovoltaic power generation has the advantages of simple energy conversion process, no pollution emission and no noise, so developing and utilizing solar energy has become the strategic decision of sustainable energy development of countries around the world.

[0003] The photovoltaic cell packaging and welding has developed from two grid lines to SMBB interconnection technology, and then to the current 0BB interconnection technology. The mass production film technology used in the production process of photovoltaic cells covers the entire film on the cell, and the amount of carrier film used in the interconnection process is large. Moreover, due to the poor connection between the welding strip and the edge of the carrier film, edge virtual welding may occur after lamination or after the connection strength of the welding spot is tested by heat cycle test. CONTENT OF THE UTILITY MODEL

[0004] To solve one of the above technical problems, the utility model provides a cell string and a photovoltaic module.

[0005] The utility model embodiment first aspect provides a cell string, the cell string includes a plurality of cell piece, the welding band of connecting adjacent cell piece, strip carrier film and first glass fiber carrier film, the first cover section, second cover section and exposed section of the welding band are included, the surface of each welding band first cover section is respectively laid with a strip carrier film, the surface of the second cover section of the welding band is laid with first glass fiber carrier film, the length direction of the first glass fiber carrier film is perpendicular to the length direction of the welding band, and the first glass fiber carrier film covers a plurality of welding bands on the surface of the corresponding cell piece, and the exposed section extends beyond the edge of the cell piece.

[0006] Preferably, the two ends of each strip carrier film are flush.

[0007] Preferably, the upper edge of the first glass fiber carrier film is in contact with the lower edge of the strip carrier film, and the lower edge of the first glass fiber carrier film is flush with the lower edge of the cell piece.

[0008] Preferably, the first cover section of the welding band further extends upwardly to have a third cover section, the surface of the third cover section of the welding band is laid with a second glass fiber carrier film, the length direction of the second glass fiber carrier film is perpendicular to the length direction of the welding band, and the second glass fiber carrier film covers a plurality of welding bands on the surface of the corresponding cell piece.

[0009] Preferably, the upper edge of the second fiberglass carrier film is flush with the upper edge of the battery piece, and the lower edge of the second fiberglass carrier film is in contact with the upper edge of the strip-shaped carrier film.

[0010] Preferably, the rough surface is a jagged line surface.

[0011] Preferably, the rough surface is a jagged line surface.

[0012] Preferably, the thickness of the strip-shaped carrier film, the first fiberglass carrier film and the second fiberglass carrier film is 0.05mm to 0.3mm.

[0013] Preferably, the strip-shaped carrier film is a PVE carrier film, a POE carrier film, a TPO carrier film or an EVA carrier film.

[0014] The second aspect of the embodiment of the utility model provides a photovoltaic module, the photovoltaic module includes the battery string as described in the first aspect of the utility model embodiment.

[0015] The battery string provided by the utility model prevents the welding band from being offset in the laminating process, reduces the occurrence of false welding, and helps to improve the yield of finished products. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application.

[0017] Figure 1 It is a side view of the position of the welding band, the strip-shaped carrier film and the first fiberglass carrier film on any one battery piece in the battery string described in the embodiment 1 of the utility model.

[0018] Figure 2 It is a structure schematic view of the welding band described in the embodiment 1 of the utility model.

[0019] Figure 3 It is a side view of the position of the welding band, the strip-shaped carrier film and the first fiberglass carrier film on any one battery piece in the battery string described in the embodiment 1 of the utility model.

[0020] Figure 4 It is a position schematic view between the welding band and the strip-shaped carrier film after the strip-shaped carrier film is coated on the battery string described in the embodiment 1 of the utility model.

[0021] Figure 5The first glass fiber carrier film rough surface schematic view of the embodiment 1 of the utility model discloses;

[0022] Figure 6 The structure schematic view of the welding band of the embodiment 2 of the utility model discloses;

[0023] Figure 7 The side view of the welding band, strip carrier film and the first glass fiber carrier film position of any one battery piece in the battery string of the embodiment 2 of the utility model discloses.

[0024] Reference signs:

[0025] 1, battery piece, 2, strip carrier film, 3, first glass fiber carrier film, 4, welding band, 5, rough surface, 6, second glass fiber carrier film;

[0026] 4-1, first covering section, 4-2, second covering section, 4-3, exposed section, 4-4, third covering section. DETAILED DESCRIPTION

[0027] In order to make the technical scheme and advantages in the embodiments of the present application more clear and apparent, the exemplary embodiments of the present application are further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] Embodiment 1

[0029] As Figure 1 shown, the embodiment provides a battery string, which comprises a plurality of battery pieces 1 and welding bands connecting adjacent battery pieces. Among them, the welding band 4 is fixed on the front and back of the battery piece 1. The surface of the welding band 4 is paved with a carrier film.

[0030] Specifically, in the embodiment, the number of welding bands 4 fixed on the front and back of the battery piece 1 can be determined according to the specific type, size of the battery piece 1 and actual production demand, which is not specially limited in the embodiment. In the embodiment, taking the front of the battery piece 1 as an example, the welding band 4 can be sequentially divided into three parts of the first covering section 4-1, the second covering section 4-2 and the exposed section 4-3 from top to bottom, as shown in the figure. Figure 2 If it is the back of the battery piece 1, the welding band 4 on the back can be inverted mirror image of the welding band 4 on the front. Among them, the surface of the first covering section 4-1 is paved with a strip carrier film 2, the second covering section 4-2 is paved with a first glass fiber carrier film 3, and the exposed section 4-3 extends beyond the edge of the battery piece 1, as shown in the figure. Figure 3

[0031] ​More specifically, in the embodiment, the first fiberglass carrier film 3 is a strip-shaped integrated carrier film. The length direction of the first fiberglass carrier film 3 is perpendicular to the length direction of the solder strip 4, and the first fiberglass carrier film 3 can cover a plurality of solder strips 4 on the surface of the corresponding battery sheet 1, so as to be laid on the surface of the second covering section 4-2 of all the solder strips 4.

[0032] In the embodiment, the first fiberglass carrier film 3 is a fiberglass-reinforced adhesive film composite composed of adhesive film resin, antioxidant, silane coupling agent, initiator, co-crosslinking agent and glass fiber, which has high strength and good insulation performance. By laying the strip-shaped integrated fiberglass carrier film on one end of the solder strip 4, the solder strip 4 at the edge of the battery sheet 1 is further fixed, which prevents the solder strip 4 from being displaced during the lamination process and reduces the occurrence of false welding, thereby helping to improve the yield of finished products.

[0033] Before the film covering, the battery string first pre-fixes the solder strip 4 on one side of the battery sheet 1, covers the strip-shaped carrier film 2 on the first covering section 4-1 of each solder strip 4, and then covers the strip-shaped integrated first fiberglass carrier film 3 on the second covering section 4-2 of the solder strip 4. Then the solder strip 4 is pre-fixed on the other side of the battery and the above process is repeated. Finally, the strip-shaped carrier film 2 and the first fiberglass carrier film 3 are melted and bonded by means of heat radiation, laser heating, etc., as shown in Figure 4 , so as to fix the solder strip 4 on the battery sheet 1.

[0034] In some alternative embodiments, each strip-shaped carrier film 2 is equal in length, and the positions of the first covering sections 4-1 of the covered solder strips 4 are also the same. That is, the upper edges of each strip-shaped carrier film 2 are flush, and the lower edges of each strip-shaped carrier film 2 are also flush.

[0035] In some alternative embodiments, the upper edge of the first fiberglass carrier film 3 is in contact with the lower edge of the strip-shaped carrier film 2, that is, there is no gap between the upper edge of the first fiberglass carrier film 3 and the lower edge of the strip-shaped carrier film 2. The lower edge of the first fiberglass carrier film 3 is flush with the lower edge of the battery sheet 1, so that the first fiberglass carrier film 3 can cover the solder strip 4 at the edge of the battery sheet 1.

[0036] In some alternative embodiments, the side of the first fiberglass carrier film 3 in contact with the solder strip 4 is a rough surface 5, so as to increase the friction between the first fiberglass carrier film 3 and the surface of the battery sheet 1, and make the first fiberglass carrier film 3 and the battery sheet 1 better in contact.

[0037] Specifically, the side of the first fiberglass carrier film 3 in contact with the solder strip 4 can be processed with sawtooth lines to form a rough surface 5, as shown in Figure 5 . After the solder strip 4 is laminated, the first fiberglass carrier film 3 can better fix the soldering point of the solder strip 4, preventing the solder strip 4 from being displaced due to thermal expansion and contraction in high and low temperature environments, and thus preventing false welding.

[0038] In some optional embodiments, the battery piece 1 can be a TOPCon battery, an HJT battery, a BC battery, etc.

[0039] In some optional embodiments, the solder strip 4 is a low-temperature solder strip 4, the middle of the solder strip 4 is Cu, and the outside is coated with a coating. The coating is an alloy of Sn, Pb, and Bi elements.

[0040] In some optional embodiments, the strip-shaped carrier film 2 is a PVE carrier film, a POE carrier film, a TPO carrier film, or an EVA carrier film.

[0041] In some optional embodiments, the thickness of the strip-shaped carrier film 2 and the first glass fiber carrier film 3 is 0.05 mm to 0.3 mm, and can be 0.05 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.28 mm, 0.3 mm, etc. according to the size of the solder strip 4.

[0042] Embodiment 2

[0043] On the basis of embodiment 1, another battery string is proposed in this embodiment, which includes a plurality of battery pieces 1 and solder strips connecting adjacent battery pieces. Among them, the solder strip 4 is fixed on the front and back surfaces of the battery piece 1. The surface of the solder strip 4 is paved with a carrier film.

[0044] Specifically, in this embodiment, the number of solder strips 4 fixed on the front and back surfaces of the battery piece 1 can be determined according to the specific type, size of the battery piece 1, and actual production needs, which is not specially limited in this embodiment. In this embodiment, taking the front surface of the battery piece 1 as an example, the solder strip 4 can be sequentially divided into a third covering section 4-4, a first covering section 4-1, a second covering section 4-2, and an exposed section 4-3 from top to bottom, as shown in FIG. 4. That is, on the basis of the solder strip 4 of embodiment 1, the third covering section 4-4 is extended above the first covering section 4-1. If it is the back surface of the battery piece 1, the solder strip 4 of the back surface can be inverted in mirror image with the solder strip 4 of the front surface. Among them, the surface of the first covering section 4-1 is paved with a strip-shaped carrier film 2, the second covering section 4-2 is paved with a first glass fiber carrier film 3, the surface of the third covering section 4-4 is paved with a second glass fiber carrier film 6, and the exposed section 4-3 extends beyond the edge of the battery piece 1, as shown in FIG. 4. Figure 6 Figure 7

[0045] More specifically, in this embodiment, the second glass fiber carrier film 6 is completely the same as the first glass fiber carrier film 3, and both are strip-shaped integrated carrier films. The length direction of the second glass fiber carrier film 6 is perpendicular to the length direction of the solder strip 4, and the first glass fiber carrier film 3 can cover a plurality of solder strips 4 on the surface of the corresponding battery piece 1, so as to be paved on the surface of the third covering section 4-4 of all solder strips 4.​​

[0046] In some optional embodiments, the upper edge of the second fiberglass carrier film 6 is flush with the upper edge of the battery piece 1, so that the second fiberglass carrier film 6 can cover the solder strip 4 at the edge of the battery piece 1. The lower edge of the second fiberglass carrier film 6 is in contact with the upper edge of the strip-shaped carrier film 2, i.e. there is no gap between the lower edge of the second fiberglass carrier film 6 and the upper edge of the strip-shaped carrier film 2.

[0047] In some optional embodiments, the side of the second fiberglass carrier film 6 in contact with the solder strip 4 is a rough surface 5, so as to increase the friction between the second fiberglass carrier film 6 and the surface of the battery piece 1, and make the second fiberglass carrier film 6 better contact with the battery piece 1.

[0048] Specifically, the side of the second fiberglass carrier film 6 in contact with the solder strip 4 can be processed with sawtooth lines to form a rough surface 5, as shown in FIG. 5. Figure 5 After the solder strip 4 is laminated, the second fiberglass carrier film 6 can better fix the solder strip 4 as a solder point, and prevent the solder strip 4 from being displaced due to thermal expansion and contraction in high and low temperature environments, and thus prevent the occurrence of false welding.

[0049] In some optional embodiments, the thickness of the second fiberglass carrier film 6 is 0.05mm to 0.3mm, and can be 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, etc. according to the size of the solder strip 4.

[0050] Embodiment 3

[0051] This embodiment proposes a battery string, which includes a battery string. The specific structure of the battery string can refer to the content described in Embodiment 1 or Embodiment 2, and this embodiment will not be described again.

[0052] The battery string proposed in this embodiment covers each solder strip 4 with a strip-shaped carrier film 2, and lays a strip-shaped integrated fiberglass carrier film at one end of the solder strip 4 to further fix the solder strip 4 at the edge of the battery piece 1, so as to prevent the solder strip 4 from being displaced during the lamination process and reduce the occurrence of false welding, which helps to improve the yield of finished products.

[0053] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A battery string, characterized in that, The battery string comprises a plurality of battery pieces, a welding strip connecting adjacent battery pieces, a strip-shaped carrier film and a first glass fiber carrier film, the welding strip comprises a first covering section, a second covering section and an exposed section, the first covering section of each welding strip is respectively laid with a strip-shaped carrier film, the second covering section of the welding strip is laid with a first glass fiber carrier film, the length direction of the first glass fiber carrier film is perpendicular to the length direction of the welding strip, the first glass fiber carrier film covers a plurality of welding strips on the surface of the corresponding battery piece, and the exposed section extends beyond the edge of the battery piece.

2. The battery string of claim 1, wherein, Both ends of each strip-shaped carrier film are flush.

3. The battery string of claim 2, wherein, The upper edge of the first glass fiber carrier film is in contact with the lower edge of the strip-shaped carrier film, and the lower edge of the first glass fiber carrier film is flush with the lower edge of the battery piece.

4. The battery string of claim 1, wherein, The first covering section of the welding strip further extends upwardly to a third covering section, the third covering section of the welding strip is laid with a second glass fiber carrier film, the length direction of the second glass fiber carrier film is perpendicular to the length direction of the welding strip, and the second glass fiber carrier film covers a plurality of welding strips on the surface of the corresponding battery piece.

5. The battery string of claim 4, wherein, The upper edge of the second glass fiber carrier film is flush with the upper edge of the battery piece, and the lower edge of the second glass fiber carrier film is in contact with the upper edge of the strip-shaped carrier film.

6. The battery string of claim 4, wherein, The rough surface is a zigzag pattern surface.

7. The battery string of claim 6, wherein, The thickness of the strip-shaped carrier film, the first glass fiber carrier film and the second glass fiber carrier film is 0.05mm to 0.3mm.

8. The battery string of claim 1, wherein, The strip-shaped carrier film is a PVE carrier film, a POE carrier film, a TPO carrier film or an EVA carrier film.

9. The battery string of claim 1, wherein, The photovoltaic module comprises the battery string according to any one of claims 1 to 9.

10. A photovoltaic module, characterized by, ​

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