Battery piece unit assembly, preparation device thereof and battery string

Abstract

The utility model relates to the technical field of photovoltaic assembly manufacturing, and particularly discloses a battery piece unit assembly, a preparation device thereof and a battery string. The battery piece unit assembly comprises a battery piece, a welding strip group and a strip film group, the strip film group comprises at least one strip film, and one surface of the strip film is provided with a bonding layer; a solder strip in the solder strip group comprises a first solder strip section positioned on the battery piece and a second solder strip section extending out of the battery piece, and the first solder strip section is vertically intersected with each silver fine grid line positioned on the same surface of the battery piece; the strip film is laid on the first welding strip section in the length direction of the welding strip, and the first welding strip section and the battery piece are bonded and fixed through the bonding layer; and the bonding layer can prevent the molten strip film from overflowing glue to cause poor contact between the first welding strip section and the battery piece. The battery piece unit assembly, the preparation device thereof and the battery string can effectively solve the problem of poor electrical contact of a product caused by the fact that the solder strip is separated from the silver fine grid line on the battery piece due to glue overflow.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic assembly manufacturing, in particular to a battery cell unit assembly and a preparation device thereof, and a battery string. Background Art

[0002] In the process of interconnecting photovoltaic cells into strings, welding tape is required to connect the positive and negative electrodes of two adjacent cells; for main grid-free cells, the welding tape needs to be pre-bonded and fixed before lamination to prevent the cells from slipping and falling off after being strung. The current method of pre-bonding and fixing welding tape is to heat the EVA strip film laid on the welding tape group to make it sticky, so as to bond and fix each welding tape in the welding tape group to the cell. However, after fixing the welding tape in this way, glue overflow is prone to occur during lamination heating, that is, the molten glue of the EVA strip film enters the gap between the welding tape and the cell, causing the welding tape to lose contact with the fine silver grid lines on the cell, resulting in poor electrical contact of the product, which is prone to cause hot spot effect and other phenomena. Summary of the invention

[0003] The utility model aims to provide a battery cell unit assembly and a preparation device thereof, and a battery string, which can effectively solve the problem of poor electrical contact of the product caused by the separation of the soldering tape and the silver fine grid lines on the battery cell due to glue overflow.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A battery cell unit assembly comprises a battery cell, a welding ribbon group and a strip film group, wherein the strip film group comprises at least one strip film, and an adhesive layer is provided on one side of the strip film;

[0006] The welding strips in the welding strip group include a first welding strip segment located on the battery cell and a second welding strip segment extending out of the battery cell, and the first welding strip segment intersects vertically with each silver fine grid line located on the same side of the battery cell;

[0007] The strip film is laid on the first welding strip segment along the length direction of the welding strip, and the first welding strip segment and the battery cell are bonded and fixed by the adhesive layer; the adhesive layer can prevent the melted strip film from overflowing and causing poor contact between the first welding strip segment and the battery cell.

[0008] Furthermore, the adhesive layer is a high-toughness pressure-sensitive adhesive layer, a thermosetting adhesive layer, a hot-melt adhesive layer or a UV adhesive layer.

[0009] Furthermore, the thickness of the adhesive layer is 0.5 mm to 2 mm.

[0010] Furthermore, the strip film is one of EVA film, POE film, PET film and EPE film.

[0011] A battery string, comprising the second strip film group and a plurality of the above-mentioned battery cell unit assemblies;

[0012] The second welding strip segment is located on the adjacent battery cell and vertically intersects with each silver fine grid line located on the same side of the battery cell;

[0013] The strip films in the second strip film group are laid on the second welding tape segment along the length direction of the welding tape, and the second welding tape segment and the battery cell are bonded and fixed by the adhesive layer.

[0014] A preparation device for preparing the above-mentioned battery cell unit assembly; the preparation device comprises:

[0015] A preparation platform, wherein a plurality of vacuum adsorption holes are provided on the preparation platform;

[0016] A cell loading mechanism capable of loading the cell onto the preparation platform;

[0017] A welding ribbon group feeding mechanism, capable of laying the first welding ribbon segment of each welding ribbon in the welding ribbon group on the battery cell located on the preparation platform, and each second welding ribbon segment extending out of the battery cell;

[0018] The strip film group feeding mechanism can lay the strip film group on each first welding strip segment along the length direction of the welding strip, so as to bond and fix the first welding strip segment and the battery cell through the adhesive layer.

[0019] Furthermore, the strip film group feeding mechanism includes a polygonal turntable that can rotate and move up and down, and each side of the polygonal turntable is provided with a plurality of vacuum adsorption holes for adsorbing and fixing the strip films; the outer periphery of the polygonal turntable is provided with a cutting mechanism and a glue spraying mechanism, and the cutting mechanism can cut the strip films adsorbed and fixed on the polygonal turntable to obtain a group of strip films of preset length; the glue spraying mechanism can form an adhesive layer on the cut group of strip films.

[0020] Furthermore, the preparation device also includes a pressing mechanism, which can press down the strip film group so that the pressure-sensitive adhesive layer serving as the adhesive layer has adhesion to bond and fix the first welding strip segment and the battery cell.

[0021] Furthermore, the preparation device also includes a heating mechanism, which can heat the strip film group so that the thermosetting adhesive layer or the hot melt adhesive layer serving as the adhesive layer has adhesiveness to bond and fix the first welding strip segment and the battery cell.

[0022] Furthermore, the preparation device also includes a UV curing mechanism, which can perform UV curing on the strip film group so that the UV glue layer serving as the adhesive layer has viscosity to bond and fix the first welding strip segment and the battery cell.

[0023] The beneficial effects of the utility model are:

[0024] 1. A battery cell unit assembly and a battery string of the utility model are provided with an adhesive layer on one side of a strip film, and the strip film is used as a carrier to bond the first welding strip segment to the battery cell. After entering the lamination process, the adhesive layer itself has high toughness, which can prevent the molten strip film from breaking through the protection of the adhesive layer, thereby avoiding overflow of glue and causing the welding strip to separate from the silver fine grid lines on the surface of the battery cell during lamination, thereby improving the product yield and the connection performance of the photovoltaic module board to a certain extent.

[0025] 2. The utility model provides a device for preparing a battery cell unit assembly, which has high operating efficiency. The prepared battery cell unit assembly can avoid the soldering tape from being separated from the silver fine grid lines on the surface of the battery cell during lamination due to glue overflow, and the product yield is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a battery cell unit assembly provided by the utility model.

[0027] Figure 2 yes Figure 1 Enlarged schematic diagram of point I in the middle.

[0028] Figure 3 It is a partial structural schematic diagram of a battery cell unit assembly provided by the utility model.

[0029] Figure 4 It is a partial structural schematic diagram of a battery string provided by the utility model.

[0030] Figure 5 It is a structural schematic diagram of a preparation device provided by the utility model. DETAILED DESCRIPTION

[0031] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] Embodiment 1

[0033] like Figures 1 to 3As shown, a cell unit assembly includes a cell 1, a welding tape group and a strip film group. The strip film group includes at least one strip film 3, and a bonding layer 4 is provided on one side of the strip film 3; the welding tape 2 in the welding tape group includes a first welding tape segment 21 located on the cell 1 and a second welding tape segment 22 extending from the cell 1, and the first welding tape segment 21 is perpendicularly intersected with each silver fine grid line 11 located on the same side of the cell 1; the strip film 3 is laid on the first welding tape segment 21 along the length direction of the welding tape, and the first welding tape segment 21 and the cell 1 are bonded and fixed by the bonding layer 4; the bonding layer 4 can prevent the melted strip film 3 from overflowing and causing poor contact between the first welding tape segment 21 and the cell 1.

[0034] In this embodiment, the adhesive layer 4 is preferably a high-toughness pressure-sensitive adhesive layer, a thermosetting adhesive layer, a hot-melt adhesive layer or a UV adhesive layer, wherein the thickness of the adhesive layer 4 is preferably 0.5 mm to 2 mm.

[0035] In this embodiment, the strip film 3 is one of EVA film, POE film, PET film and EPE film.

[0036] The cell unit assembly of this embodiment is provided with an adhesive layer 4 on one side of the strip film 3, and the strip film is used as a carrier to bond the first welding strip segment 21 of the welding strip 2 to the cell 1. After entering the lamination process, the laminating adhesive film and the strip film in the cell unit assembly can be mutually soluble, thereby improving the uniformity of the photovoltaic assembly medium. In addition, since the adhesive layer 4 itself has high toughness, it can prevent the molten strip film from breaking through the protection of the adhesive layer 4, thereby avoiding the overflow of the adhesive and causing the welding strip 2 to separate from the silver fine grid lines 11 on the surface of the cell 1 during lamination, thereby improving the yield of the photovoltaic cell unit assembly and improving the connection performance of the photovoltaic assembly board to a certain extent.

[0037] Embodiment 2

[0038] like Figure 4 As shown, a battery string includes a second strip film group and a plurality of battery cell unit assemblies, the structure of the battery cell unit assembly refers to the first embodiment; wherein the second welding strip segment 22 is located on the adjacent battery cell 1 and perpendicularly intersects with each silver fine grid line 11 located on the same surface of the battery cell 1; the strip film 3 in the second strip film group is laid on the second welding strip segment 22 along the length direction of the welding strip, and the second welding strip segment 22 and the battery cell 1 are bonded and fixed by the adhesive layer 4.

[0039] In the battery string of this embodiment, the strip films on the front and back of the battery cell are bonded and fixed to the welding tape 2 and the battery cell 1 by the adhesive layer 4. In the lamination process, the laminating adhesive film and the strip films in the battery string can be mutually dissolved, thereby improving the uniformity of the photovoltaic module medium. In addition, since the adhesive layer 4 itself has high toughness, it can prevent the molten strip film from breaking through the protection of the adhesive layer 4, thereby avoiding the overflow of glue causing the welding tape 2 to separate from the silver fine grid line 11 on the surface of the battery cell 1 during lamination, thereby improving the yield of the battery string and improving the connection performance of the photovoltaic module board to a certain extent.

[0040] Embodiment 3

[0041] like Figure 5 As shown, a preparation device is used for the battery cell unit assembly in Example 1; the preparation device includes a preparation platform 5, a battery cell feeding mechanism 6, a welding tape group feeding mechanism 7 and a strip film group feeding mechanism 8. Among them, the preparation platform 5 is provided with a plurality of vacuum adsorption holes for adsorbing and fixing the battery cell 1; the battery cell feeding mechanism 6 is used to feed the battery cell 1 to the preparation platform 5; the welding tape group feeding mechanism 7 is used to feed the welding tape group, and the first welding tape segment 21 of each welding tape 2 in the welding tape group is laid on the battery cell 1 located on the preparation platform 5, and each second welding tape segment 22 extends out of the battery cell; the strip film group feeding mechanism 8 is used to feed the strip film group, and lay the strip film group on each first welding tape segment 21 along the length direction of the welding tape, so as to bond and fix the first welding tape segment 21 and the battery cell 1 through the adhesive layer 4.

[0042] In this embodiment, the cell loading mechanism 6 includes a suction cup bracket 61 , a plurality of suction cups 62 distributed on the suction cup bracket 61 , and a mechanical arm driving the suction cup bracket 61 to move in a two-dimensional or three-dimensional space.

[0043] In this embodiment, the welding ribbon group feeding mechanism 7 includes a vacuum adsorption plate 71 for vacuum adsorption and fixing the welding ribbon group and a mechanical arm for driving the vacuum adsorption plate 71 to move in a two-dimensional or three-dimensional space. Among them, a plurality of welding ribbon grooves are opened on the bottom surface of the vacuum adsorption plate 71, the depth of the welding ribbon grooves is less than the outer diameter of the welding ribbon, and a plurality of vacuum adsorption holes are opened in the welding ribbon grooves.

[0044] In this embodiment, the strip film group feeding mechanism 8 includes a polygonal turntable 81 that can rotate and move up and down, and each side of the polygonal turntable 81 is provided with a plurality of vacuum adsorption holes for adsorbing and fixing the strip film; the outer periphery of the polygonal turntable 81 is provided with a cutting mechanism 82, and the cutting mechanism 82 is used to cut the strip film, and the cut strip film is still adsorbed and fixed on the polygonal turntable 81. The strip film group feeding mechanism 8 can be used to realize segmented cutting of the strip film 3 with the adhesive layer 4 to obtain a strip film group, and lay the obtained strip film group on each first welding belt segment.

[0045] The polygonal turntable 81 has a hexagonal radial cross section. The polygonal turntable 81 is connected to a motor for driving the turntable 81 to rotate and a lifting cylinder for driving the turntable 81 to lift.

[0046] The cutting mechanism 82 includes a cutting knife and a driving member that drives the cutting knife to move along the central axis of the polygonal turntable 81. The driving member is preferably an electric linear slide. The edge between two adjacent sides of the polygonal turntable 81 is provided with a clearance groove for avoiding the cutting knife.

[0047] In another embodiment of the strip module feeding mechanism 8, a glue applying mechanism 83 is provided on one side of the polygonal turntable 81. The glue applying mechanism 83 applies glue to the strip film 3 adsorbed and fixed on the polygonal turntable 81 to form an adhesive layer 4 by means of glue spraying or printing. The structure of the glue applying mechanism 83 is prior art and will not be described in detail.

[0048] When in use, the end of the strip film released from the strip film roll is adsorbed and fixed on the polygonal turntable 81; the cutting mechanism 82 cuts the strip film adsorbed and fixed on the polygonal turntable 81 to obtain a group of strip films 3 of a preset length; the glue spraying mechanism 83 sprays glue on the cut group of strip films 3 to form an adhesive layer 4, thereby obtaining a strip film group; after the strip film group rotates with the polygonal turntable 81 to above the first welding strip segment 21 of each welding strip 2, the polygonal turntable 81 moves downward, thereby laying the strip film group on each first welding strip segment 21.

[0049] As a first implementation of this embodiment, the preparation device further includes a pressing mechanism for pressing the strip film group. The pressing mechanism includes a pressing plate and a pressing plate cylinder driving the pressing plate to move up and down. When in use, the strip film group is pressed by the pressing mechanism, so that the pressure-sensitive adhesive layer as the adhesive layer 4 has adhesiveness to bond and fix the first welding strip segment 21 and the battery cell 1.

[0050] As a second implementation of this embodiment, the preparation device also includes a heating mechanism 9 for heating each adhesive layer 4 in the strip film group. The heating mechanism 9 can be set on the side of the polygonal turntable 81, using infrared radiation heating, including a connection seat and a group of infrared heating tubes installed on the connection seat. The heating mechanism can also be heated by an electric heating rod, including a group of electric heating rods buried in the polygonal turntable 81. When in use, the strip film group is heated by the heating mechanism, so that the thermosetting adhesive layer as the adhesive layer 4 can be cured to bond and fix the first welding strip segment 21 and the battery cell 1, or the hot melt adhesive layer as the adhesive layer 4 has viscosity to bond and fix the first welding strip segment 21 and the battery cell 1.

[0051] As a third implementation of this embodiment, the preparation device also includes a UV curing mechanism for UV curing each adhesive layer 4 in the strip film group. The UV curing mechanism is arranged on the side of the polygonal turntable 81, and includes a bracket and a plurality of UV curing lamps distributed on the bracket. When in use, the UV curing mechanism is used to cure each adhesive layer 4 in the strip film group, so that the UV glue layer as the adhesive layer 4 has adhesiveness to bond and fix the first welding strip segment 21 and the battery cell 1.

[0052] It should be noted that, since the EVA strip film has higher transparency after hot melting and better ultraviolet light resistance, the heating mechanism 9 can be used together with the UV curing mechanism.

[0053] A preparation device of this embodiment, when in use, firstly uses the cell feeding mechanism 6 to feed the cell 1 to the preparation platform 5, and fixes the cell 1 by adsorbing through the vacuum adsorption holes on the preparation platform 5; then uses the welding strip group feeding mechanism 7 to feed the welding strip group, so that the first welding strip segment 21 of each welding strip 2 is laid on the cell 1, and each second welding strip segment 22 extends out of the cell 1; then uses the strip film group feeding mechanism 8 to feed the strip film group, so that each strip film in the strip film group is laid on each first welding strip segment 21 along the length direction of the welding strip; finally, through the pressing mechanism, the heating mechanism 9 or the UV curing mechanism, or the combined action of the heating mechanism 9 and the UV curing mechanism, the adhesive layer 4 is cured or has adhesiveness to bond and fix the first welding strip segment 21 and the cell 1. The preparation device has high operating efficiency, and the prepared cell unit assembly can avoid the overflow of glue causing the welding strip 2 to separate from the silver fine grid line 11 on the surface of the cell 1 during lamination, thereby improving the product yield and improving the connection performance of the photovoltaic module board to a certain extent.

[0054] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A battery cell unit assembly, characterized in that: It comprises a battery cell (1), a welding ribbon group and a strip film group, wherein the strip film group comprises at least one strip film (3), and one side of the strip film (3) is provided with an adhesive layer (4); The welding strip (2) in the welding strip group comprises a first welding strip segment (21) located on the battery cell (1) and a second welding strip segment (22) extending out of the battery cell (1), and the first welding strip segment (21) intersects vertically with each silver fine grid line (11) located on the same surface of the battery cell (1); The strip film (3) is laid on the first welding strip segment (21) along the length direction of the welding strip, and the first welding strip segment (21) and the battery cell (1) are bonded and fixed by the adhesive layer (4); the adhesive layer (4) can prevent the melted strip film (3) from overflowing and causing poor contact between the first welding strip segment (21) and the battery cell (1).

2. A battery cell unit assembly according to claim 1, characterized in that: The adhesive layer (4) is a high-toughness pressure-sensitive adhesive layer, a thermosetting adhesive layer, a hot-melt adhesive layer or a UV adhesive layer.

3. A battery cell unit assembly according to claim 1, characterized in that: The strip film (3) is one of EVA film, POE film, PET film and EPE film.

4. A battery string, characterized in that: It comprises the second strip film group and a plurality of battery cell unit assemblies according to any one of claims 1 to 3; The second welding strip segment (22) is located on the adjacent battery cell (1) and vertically intersects with each silver fine grid line (11) located on the same surface of the battery cell (1); The strip film (3) in the second strip film group is laid on the second welding strip segment (22) along the length direction of the welding strip, and the second welding strip segment (22) and the battery cell (1) are bonded and fixed by the bonding layer (4).

5. A preparation device for preparing the battery cell unit assembly according to any one of claims 1 to 3; characterized in that: The preparation device comprises: A preparation platform (5), wherein a plurality of vacuum adsorption holes are provided on the preparation platform (5); A battery cell loading mechanism (6) capable of loading the battery cell (1) onto the preparation platform (5); A welding ribbon group feeding mechanism (7) capable of placing the first welding ribbon segment (21) of each welding ribbon (2) in the welding ribbon group on the battery cell (1) located on the preparation platform (5), and each second welding ribbon segment (22) extending out of the battery cell; The strip film group feeding mechanism (8) is capable of laying the strip film group on each first welding strip segment (21) along the length direction of the welding strip, so as to bond and fix the first welding strip segment (21) and the battery cell (1) through the bonding layer (4).

6. A preparation device according to claim 5, characterized in that: The strip film group feeding mechanism (8) comprises a polygonal turntable (81) which can rotate and move up and down, and each side surface of the polygonal turntable (81) is provided with a plurality of vacuum adsorption holes for adsorbing and fixing the strip films (3); a cutting mechanism (82) is arranged on the outer periphery of the polygonal turntable (81), and the cutting mechanism (82) can cut the strip films adsorbed and fixed on the polygonal turntable (81).

7. A preparation device according to claim 6, characterized in that: The strip film group feeding mechanism (8) further comprises a glue applying mechanism (83), and the glue applying mechanism (83) is capable of applying glue to a group of strip films (3) adsorbed and fixed on the polygonal turntable (81) to form an adhesive layer (4).

8. A preparation device according to claim 5, characterized in that: The preparation device also includes a pressing mechanism, which can press down the strip film group so that the pressure-sensitive adhesive layer serving as the bonding layer (4) has adhesiveness to bond and fix the first welding strip segment (21) and the battery cell (1).

9. A preparation device according to claim 5, characterized in that: The preparation device further comprises a heating mechanism (9), wherein the heating mechanism (9) is capable of heating the strip film group so as to solidify the thermosetting adhesive layer as the bonding layer (4) so ​​as to bond and fix the first welding strip segment (21) and the battery cell (1), or to make the hot melt adhesive layer as the bonding layer (4) have adhesiveness so as to bond and fix the first welding strip segment (21) and the battery cell (1).

10. A preparation device according to claim 5, characterized in that: The preparation device further comprises a UV curing mechanism, which is capable of UV curing the strip film group so that the UV glue layer serving as the bonding layer (4) has adhesiveness to bond and fix the first welding strip segment (21) and the battery cell (1).

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