Battery string and photovoltaic module

Abstract

The utility model discloses a cell string and a photovoltaic assembly, which are applied to the technical field of photovoltaic cells, and comprise a main-grid-free photovoltaic cell sheet, at least two first carrier films, at least one welding strip and a second carrier film, the first carrier film and the welding strip are arranged on the surface of the main-grid-free photovoltaic cell; the second carrier film covers the first carrier film and the welding strip; the first carrier films extend along a first direction and are arranged at intervals along a second direction; the solder strip extends along the first direction and is located between two adjacent first carrier films. An independent strip-shaped carrier film is arranged on the surface of a main-grid-free photovoltaic battery piece, a welding strip arranged between the adjacent strip-shaped carrier films is limited, and then the whole carrier film is laid to cover the strip-shaped carrier film and the welding strip, so that the welding strip can be pre-fixed on the surface of the main-grid-free photovoltaic battery piece at low temperature before lamination; interconnection between the welding strip and the main-grid-free photovoltaic cell is realized, so that on one hand, the use amount of a carrier film is reduced; on the other hand, deviation of the welding strip can be prevented, and the yield of finished products can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, in particular to a battery string and a photovoltaic component. Background Art

[0002] The development of photovoltaic cell packaging and welding has gradually evolved from two busbars to the use of lamination technology to achieve 0BB (Zero Busbar) interconnection technology. The current mass production lamination technology uses a whole carrier film to cover the soldering strips on the surface of the cell. The amount of carrier film used in the interconnection process is large, which increases the cost of the component. In addition, due to the loose connection of the edge, the lamination method may cause the following problems after lamination or after thermal cycling tests to test the connection strength of the solder joints. Figure 1 The same edge cold solder joint situation occurs, which reduces the yield of the finished product. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a battery string and a photovoltaic module to solve the technical problems of high coating cost and low finished product yield.

[0004] To solve the above technical problems, the present invention provides a battery string, which includes: a busbarless photovoltaic cell, at least two first carrier films, at least one welding ribbon and a second carrier film; the first carrier film and the welding ribbon are arranged on the surface of the busbarless photovoltaic cell; the second carrier film covers the first carrier film and the welding ribbon;

[0005] The first carrier films extend along a first direction and are arranged at intervals along a second direction; the welding strips extend along the first direction and are located between two adjacent first carrier films.

[0006] Optionally, the welding strip abuts against two adjacent first carrier films.

[0007] Optionally, the first carrier film is a glass fiber carrier film.

[0008] Optionally, the number of the first carrier films is 2 to 30, inclusive.

[0009] Optionally, the second carrier film includes any one of a PVE film, a POE film, a TPO film and an EVA film.

[0010] Optionally, the second carrier film has a thickness of 0.1 μm to 1000 μm, including both ends;

[0011] And / or, the size of the second carrier film is smaller than half of the busbar-less photovoltaic cell sheet or the entire busbar-less photovoltaic cell sheet.

[0012] Optionally, the soldering tape is a low-temperature soldering tape; the low-temperature soldering tape comprises a substrate and a coating wrapped around the periphery of the substrate;

[0013] The substrate is a copper substrate; and the coating is an alloy coating.

[0014] Optionally, the first carrier film and the welding ribbon are arranged on the front and back sides of the busbar-less photovoltaic cell.

[0015] In order to solve the above technical problems, the present invention further provides a photovoltaic assembly, comprising: a battery string as described above.

[0016] It can be seen that the utility model provides a cell string, including: a busbar-less photovoltaic cell, at least two first carrier films, at least one welding ribbon, and a second carrier film; the first carrier film and the welding ribbon are arranged on the surface of the busbar-less photovoltaic cell; the second carrier film covers the first carrier film and the welding ribbon; the first carrier film extends along a first direction and is arranged at intervals along a second direction; the welding ribbon extends along the first direction and is located between two adjacent first carrier films. The utility model sets an independent strip-shaped carrier film on the surface of the busbar-less photovoltaic cell to limit the welding ribbon set between adjacent strip-shaped carrier films, and then lays a whole carrier film to cover the strip-shaped carrier film and the welding ribbon, so that the welding ribbon can be pre-fixed on the surface of the busbar-less photovoltaic cell at low temperature before lamination, thereby realizing the interconnection between the welding ribbon and the busbar-less photovoltaic cell. On the one hand, the use of carrier film is reduced, the cost of OBB coating is controlled, and the module development cost is reduced; on the other hand, it can prevent the welding ribbon from deviating, which helps to ensure the yield rate of the finished product. The utility model also provides a photovoltaic module, including the above-mentioned cell string, which also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the edge cold solder joint of photovoltaic cells;

[0019] Figure 2 This is an isometric diagram of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present utility model;

[0020] Figure 3 A schematic side view of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present utility model;

[0021] Figure 4 A schematic front view of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present utility model;

[0022] Figure 5 A schematic diagram of a laminating process provided by an embodiment of the utility model.

[0023] The following are the descriptions of the reference numerals:

[0024] 1-busbarless photovoltaic cell; 2-first carrier film; 3-welding ribbon; 4-second carrier film. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] Please refer to Figures 2 to 4 , Figure 2 This is an isometric diagram of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present utility model; Figure 3 A schematic side view of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present utility model; Figure 4 This is a front view of a strip-shaped carrier film-coated interconnected battery provided by an embodiment of the present invention. A battery string provided by an embodiment of the present invention may include:

[0027] A busbar-free photovoltaic cell 1, at least two first carrier films 2, at least one welding ribbon 3 and a second carrier film 4; the first carrier film 2 and the welding ribbon 3 are arranged on the surface of the busbar-free photovoltaic cell 1; the second carrier film 4 covers the first carrier film 2 and the welding ribbon 3;

[0028] The first carrier films 2 extend along the first direction and are arranged at intervals along the second direction; the welding strips 3 extend along the first direction and are located between two adjacent first carrier films 2 .

[0029] It should be noted that the first direction and the second direction in this embodiment are two different directions parallel to the surface of the busbar-less photovoltaic cell 1. The first carrier film 2 in this embodiment is a strip-shaped carrier film extending in the same direction as the soldering ribbon 3.

[0030] This embodiment does not limit the specific type of busbarless photovoltaic cell 1. For example, the busbarless photovoltaic cell 1 may be a TOPCon (Tunnel Oxide Passivated Contact) cell, an HJT (Heterojunction Technology) cell, a BC (Back Contact) cell, or other similar cell types. It should be noted that TOPCon, HJT, and BC cells are all common cell types in the prior art. This embodiment does not limit the internal components of the busbarless photovoltaic cell 1 but directly utilizes existing finished cell products. This embodiment does not limit the specific placement of the first carrier film 2 and the soldering ribbon 3. The placement of the first carrier film 2 and the soldering ribbon 3 can be determined based on the specific type of busbarless photovoltaic cell 1. For example, the first carrier film 2 and the soldering ribbon 3 may be positioned on both the front and back sides of the busbarless photovoltaic cell 1, or on the back side of the busbarless photovoltaic cell 1.

[0031] This embodiment does not limit the specific number of busbar-less photovoltaic cells 1, and the specific number of busbar-less photovoltaic cells 1 can be determined based on specific circumstances. This embodiment does not limit the specific interconnection method of adjacent busbar-less photovoltaic cells 1, and the specific interconnection method of adjacent busbar-less photovoltaic cells 1 can be determined based on the specific type of busbar-less photovoltaic cells 1.

[0032] Furthermore, in order to more effectively define the position of the welding ribbon 3 , in this embodiment, the welding ribbon 3 may abut against two adjacent first carrier films 2 .

[0033] This embodiment does not limit the specific type of first carrier film 2; it only requires that the first carrier film 2 be capable of defining the position of the welding strip 3. For example, the first carrier film 2 can be a glass fiber carrier film. A glass fiber carrier film is a glass fiber-reinforced film composite material comprising a film resin, an antioxidant, a silane coupling agent, an initiator, a cross-linking agent, and glass fiber. Compared to conventional carrier films, glass fiber carrier films are more rigid and can more effectively define the position of the welding strip 3. It should be noted that the film resin, antioxidant, silane coupling agent, initiator, cross-linking agent, and glass fiber are all common materials in the prior art. This embodiment does not limit the internal components of the first carrier film 2; instead, a glass fiber carrier film made from existing materials is directly used.

[0034] The embodiment is not limited to the specific number of the solder strips 3, which can be changed according to the number of the solder strips 3 set in the assembly. The embodiment is not limited to the specific number of the first carrier films 2, which can be determined according to the specific number of the solder strips 3. For example, the number of the first carrier films 2 is 2-30, and the values at both ends are included. It should be noted that the embodiment needs to set the first carrier film 2 on both sides of the solder strip 3 to limit the left and right positions of the solder strip 3, and the solder strip 3 is limited between the two adjacent first carrier films 2. Therefore, the number of the first carrier film 2 is one more than the number of the solder strip 3. For example, when there is only one solder strip 3 on the surface of the main grid-free photovoltaic cell 1, the number of the first carrier film 2 is two; when there are two solder strips 3 on the surface of the main grid-free photovoltaic cell 1, the number of the first carrier film 2 is three. On the surface of the entire main grid-free photovoltaic cell 1, the first carrier film 2 and the solder strip 3 are alternately arranged in the second direction according to the order of “first carrier film 2, solder strip 3, first carrier film 2, solder strip 3, first carrier film 2, …, first carrier film 2”.

[0035] It should be noted that in the embodiment, the first carrier film 2 and the solder strip 3 are arranged on the surface of the main grid-free photovoltaic cell 1, the solder strip 3 is located between the two adjacent first carrier films 2, and the second carrier film 4 covers the first carrier film 2 and the solder strip 3. The embodiment forms a containing cavity for accommodating the solder strip 3 by the second carrier film 4 and the two adjacent first carrier films 2, and the surface of the main grid-free photovoltaic cell 1 between the two adjacent first carrier films 2, and fixes the solder strip 3 in the containing cavity.

[0036] The embodiment is not limited to the specific type of the second carrier film 4. For example, the second carrier film 4 can include any one of a PVE (Polyvinyl Ether) film, a POE (Polyether Ether Ketone) film, a TPO (Thermoplastic Polyolefin) film, and an EVA (Ethylene Vinyl Acetate) film. It should be noted that PVE, POE, TPO, and EVA are common materials in the prior art. The embodiment is not limited to the internal components of the second carrier film 4, but directly uses the carrier film made of the existing materials.

[0037] The embodiment is not limited to the specific thickness of the second carrier film 4. For example, the thickness of the second carrier film 4 can be 0.1-1000 μm, and the values at both ends are included. Preferably, the thickness of the second carrier film 4 can be 1 μm, 10 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, or 1000 μm, etc. The thickness of the second carrier film 4 of different types can be independent of each other.

[0038] This embodiment does not limit the specific size of the second carrier film 4. For example, the size of the second carrier film 4 can be smaller than half a busbar-less photovoltaic cell 1 or a whole busbar-less photovoltaic cell 1. Preferably, the size of the second carrier film 4 can be slightly smaller than half a busbar-less photovoltaic cell 1 or a whole busbar-less photovoltaic cell 1.

[0039] This embodiment does not limit the specific type of the soldering strip 3. For example, the soldering strip 3 may be a low-temperature soldering strip; the low-temperature soldering strip may include a substrate and a coating wrapped around the periphery of the substrate; the substrate may be a copper substrate; and the coating may be an alloy coating. The alloy coating may include an alloy of Sn, Pb, and Bi elements. It should be noted that copper is a common material in the prior art. This embodiment does not limit the internal components of the substrate, but directly uses a substrate made of existing materials. Sn, Pb, and Bi are also common materials in the prior art. This embodiment does not limit the internal components of the alloy coating, but directly uses an alloy coating made of existing materials.

[0040] Based on the above embodiments, the utility model sets an independent strip carrier film on the surface of the busbarless photovoltaic cell to limit the welding strip set between adjacent strip carrier films, and then lays a whole carrier film to cover the strip carrier film and the welding strip, so that the welding strip can be pre-fixed on the surface of the busbarless photovoltaic cell at low temperature before lamination, thereby realizing the interconnection between the welding strip and the busbarless photovoltaic cell. On the one hand, it reduces the use of carrier film, controls the 0BB coating cost, and thus reduces the component development cost; on the other hand, it can prevent the welding strip from deviating, which helps to ensure the yield of the finished product.

[0041] An embodiment of the present invention provides a photovoltaic assembly, comprising: the battery string as described above.

[0042] This embodiment does not limit the specific structure of the battery string. For details, please refer to the above-mentioned embodiment of the battery string, which will not be repeated here. This embodiment does not limit the specific number, arrangement and interconnection method of the battery strings. The specific number, arrangement and interconnection method of the battery strings can be determined according to specific circumstances.

[0043] Based on the above embodiments, the cell string adopted in the present invention sets an independent strip carrier film on the surface of the busbarless photovoltaic cell to limit the welding ribbon set between adjacent strip carrier films, and then lays a whole carrier film to cover the strip carrier film and the welding ribbon, so that the welding ribbon can be pre-fixed on the surface of the busbarless photovoltaic cell at low temperature before lamination, thereby realizing the interconnection between the welding ribbon and the busbarless photovoltaic cell. On the one hand, it reduces the use of carrier film, controls the 0BB coating cost, and thus reduces the component development cost; on the other hand, it can prevent the welding ribbon from deviating, which helps to ensure the yield of the finished product.

[0044] In order to make the present invention easier to understand, the following also provides one of the laminating processes that can realize the above-mentioned battery string. Figure 5 , Figure 5 A schematic diagram of a laminating process provided in an embodiment of the present invention specifically includes the following steps:

[0045] 1. Fix the back welding ribbon on the back of the busbar-free photovoltaic cell;

[0046] 2. Lay the back strip glass fiber carrier film on both sides of the back welding strip of the busbar-free photovoltaic cell;

[0047] 3. Lay the entire back carrier film on the surface of the back strip glass fiber carrier film and the back welding tape to further fix it;

[0048] 4. Fix the front welding ribbon on the front of the photovoltaic cell without busbar;

[0049] 5. Lay the front strip glass fiber carrier film on both sides of the front welding strip of the busbar-free photovoltaic cell;

[0050] 6. Lay the entire front carrier film on the surface of the front strip glass fiber carrier film and the front welding tape to further fix it;

[0051] 7. After the front carrier film is melted by thermal radiation or laser heating, it is bonded to the front strip glass fiber carrier film and the front welding tape; after the back carrier film is melted, it is bonded to the back strip glass fiber carrier film and the back welding tape.

[0052] In the cell string prepared by the coating process provided by the embodiment of the present invention, independent strip glass fiber carrier films, welding tapes, and carrier films are provided on the front and back of the busbar-free photovoltaic cell, and the welding tapes are located between adjacent strip glass fiber carrier films, and the carrier films cover the strip glass fiber carrier films and welding tapes. The cell string limits the welding tapes provided between adjacent strip glass fiber carrier films by using the independent strip glass fiber carrier films provided on the front and back of the busbar-free photovoltaic cell, and further fixes them by using the entire carrier film covering the strip glass fiber carrier films and the welding tapes, so that the welding tapes can be pre-fixed at low temperature on the front and back of the busbar-free photovoltaic cell before lamination, thereby interconnecting the welding tapes with the busbar-free photovoltaic cell. On the one hand, this reduces the amount of carrier film used, controls the 0BB coating cost, and thus reduces the component development cost; on the other hand, it can prevent the welding tapes from deviating, which helps to ensure the yield rate of the finished product.

[0053] The above is a detailed introduction to a battery string and photovoltaic module provided by the present invention. For those skilled in the art, according to the concept of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A battery string, characterized in that: include: A busbar-free photovoltaic cell, at least two first carrier films, at least one welding ribbon and a second carrier film; the first carrier film and the welding ribbon are arranged on the surface of the busbar-free photovoltaic cell; the second carrier film covers the first carrier film and the welding ribbon; The first carrier films extend along a first direction and are arranged at intervals along a second direction; the welding strips extend along the first direction and are located between two adjacent first carrier films.

2. The battery string according to claim 1, characterized in that: The welding strip abuts against two adjacent first carrier films.

3. The battery string according to claim 1, characterized in that: The first carrier film is a glass fiber carrier film.

4. The battery string according to claim 1, characterized in that The number of the first carrier films is 2 to 30, inclusive.

5. The battery string according to claim 1, characterized in that: The second carrier film includes any one of a PVE film, a POE film, a TPO film and an EVA film.

6. The battery string according to claim 1, characterized in that: The second carrier film has a thickness of 0.1 μm to 1000 μm, inclusive; And / or, the size of the second carrier film is smaller than half of the busbar-less photovoltaic cell sheet or the entire busbar-less photovoltaic cell sheet.

7. The battery string according to claim 1, characterized in that: The soldering tape is a low-temperature soldering tape; the low-temperature soldering tape comprises a base material and a coating wrapped around the periphery of the base material; The substrate is a copper substrate; and the coating is an alloy coating.

8. The battery string according to claim 1, characterized in that: The first carrier film and the welding ribbon are arranged on the front and back sides of the busbar-less photovoltaic cell sheet.

9. A photovoltaic module, characterized in that: include: The battery string according to any one of claims 1 to 8.

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