Electromagnetic welding head and welding device

Abstract

The utility model relates to the technical field of photovoltaic module welding, in particular to an electromagnetic welding head and a welding device. The electromagnetic welding head comprises a transformer assembly, a base, a coil, a magnetic core, a cover plate and shielding plates, the transformer assembly is electrically connected with the coil, the coil and the magnetic core are arranged in a long groove in the top of the base, the coil is wound around the magnetic core, the cover plate and the shielding plates are arranged on the top of the base, the cover plate is located over the magnetic core, and the shielding plates are distributed on one side or two sides of the cover plate. The shielding plate can prevent the conductive band above the shielding plate from being directly heated, thereby preventing the conductive band and the battery piece from being subjected to unsoldering or over-soldering. And the welding device comprises a cross beam and a plurality of electromagnetic welding heads, bases of the electromagnetic welding heads are sequentially fixed to the cross beam, a plurality of to-be-welded parts of the photovoltaic module can be welded at the same time, and loose welding or over welding of the conductive bands and the battery pieces is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic component welding, in particular to an electromagnetic welding head and a welding device. Background Art

[0002] In a local structure of a photovoltaic module, the connection relationship between the busbar and the battery string is as follows: Figure 1 As shown, both sides of the conductive tape at the end of the battery string are welded to the battery cell and the busbar respectively, wherein the conductive tape is first welded to the battery cell in the string welding process and then welded to the busbar in the stack welding process.

[0003] In common photovoltaic modules, the busbar is welded to the welding ribbon at the end of the battery string. Since the welding ribbon is very thin, when the electromagnetic welding head is used to weld the welding ribbon and the busbar, the eddy current generated in the welding ribbon is very small, and the temperature of the welding ribbon does not change much due to the eddy current.

[0004] However, when using the existing electromagnetic welding head to weld the conductive tape and the busbar, due to the relatively large volume of the conductive tape, large eddy currents are generated in the conductive tape, causing the temperature of the conductive tape to rise significantly, and the connection between the conductive tape and the battery cell melts, which is prone to desoldering or over-soldering problems, affecting the welding quality. Utility Model Content

[0005] In order to solve the above technical problems, the present invention provides the following solutions:

[0006] An electromagnetic welding head includes a transformer assembly, a base, a coil, a magnetic core, a cover plate and a shielding plate. The transformer assembly is electrically connected to the coil. The coil and the magnetic core are arranged in a long groove on the top of the base, and the coil is wound around the magnetic core. The cover plate and the shielding plate are arranged on the top of the base. The cover plate is located directly above the magnetic core, and the shielding plate is distributed on one side or both sides of the cover plate.

[0007] Furthermore, a plurality of grooves are provided on the cover plate at intervals.

[0008] Furthermore, a first joint is provided on the base, a first gas channel is provided inside the base, an adsorption hole is provided on the cover plate, and the first joint, the first gas channel and the adsorption hole are connected in sequence.

[0009] Furthermore, a second joint is provided on the base, a second gas channel is provided inside the base, a blowing hole is provided on the shielding plate, and the second joint, the second gas channel and the blowing hole are connected in sequence.

[0010] Furthermore, a plurality of magnetic cores are provided at intervals and are wound by the same coil.

[0011] Furthermore, the long slot is provided with a plurality of recessed areas corresponding to the number of the magnetic cores, and the magnetic cores are confined in the recessed areas.

[0012] Furthermore, a filler is provided in the long slot, and the coil and the magnetic core are wrapped and fixed by the filler.

[0013] The electromagnetic welding head provided by the utility model is used to weld a busbar and a conductive tape together. During welding, the busbar is placed on a cover plate, a portion of the conductive tape overlaps the busbar, and the other portion of the conductive tape is located above a shielding plate. When the electromagnetic welding head is working, magnetic flux lines pass through the shielding plate, that is, the electromagnetic welding head directly heats the busbar and the portion of the conductive tape overlapping the busbar. The portion of the conductive tape above the shielding plate is not directly heated and has a relatively low temperature, thereby avoiding problems such as desoldering or over-soldering.

[0014] The utility model also provides a welding device, comprising a crossbeam and a plurality of electromagnetic welding heads, wherein the bases of the plurality of electromagnetic welding heads are fixed on the crossbeam in sequence.

[0015] The welding device provided by the utility model comprises a plurality of electromagnetic welding heads, which can weld a plurality of to-be-welded parts of a photovoltaic module at the same time and avoid desoldering or over-soldering of the conductive tape and the battery sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a partial structural diagram of a photovoltaic module in the present utility model;

[0017] Figure 2 It is a three-dimensional diagram of the electromagnetic welding head of the utility model;

[0018] Figure 3 This utility model Figure 2 Magnified view of area A in the middle;

[0019] Figure 4 This is a top view of the electromagnetic welding head of the utility model;

[0020] Figure 5 This utility model Figure 4 Magnified view of area B in the middle;

[0021] Figure 6 This is a schematic diagram of the assembly relationship between the coil, magnetic core and base in the utility model;

[0022] Figure 7 This is a schematic diagram of the state after the coil and the magnetic core are wrapped with the filler in the utility model;

[0023] Figure 8 It is a three-dimensional diagram of the welding device of the present invention.

[0024] Among them: 110, busbar; 120, battery cell; 130, conductive tape; 200, electromagnetic welding head; 210, transformer assembly; 220, base; 221, first joint; 222, second joint; 230, coil; 240, magnetic core; 250, cover plate; 251, adsorption hole; 260, shielding plate; 261, blowing hole; 270, filler; 300, beam; 310, cooling channel. DETAILED DESCRIPTION

[0025] The technical solution and technical effects of the present invention are further described in detail below in conjunction with the accompanying drawings of the present invention.

[0026] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must be positioned, constructed, or operated in a specific orientation, and therefore should not be construed as limitations on the present invention. It should also be noted that, in this document, relational terms such as first and second are used solely to distinguish a first feature from a second feature, and do not necessarily require or imply any actual relationship or order between these features.

[0028] like Figure 1 The figure shows a partial structure of the central area of ​​a photovoltaic module, where the busbar 110 is welded to the conductive ribbons 130 at the ends of two battery strings, and a portion of the conductive ribbon 130 is welded to the battery cells 120. It should be noted that at both ends of the photovoltaic module, the busbar 110 is welded to only one conductive ribbon 130.

[0029] like Figure 2-Figure 6 As shown, the utility model provides an electromagnetic welding head 200, including a transformer assembly 210, a base 220, a coil 230, a magnetic core 240, a cover plate 250 and a shielding plate 260. The transformer assembly 210 is electrically connected to the coil 230, the coil 230 and the magnetic core 240 are arranged in a long groove at the top of the base 220, and the coil 230 is wound on the magnetic core 240, the cover plate 250 and the shielding plate 260 are arranged on the top of the base 220, the cover plate 250 is located directly above the magnetic core 240, and the shielding plate 260 is distributed on one side or both sides of the cover plate 250.

[0030] Transformer assembly 210 is used to increase the current flowing into coil 230. The magnitude of the current is proportional to the strength of the magnetic field. Increasing the current strengthens the magnetic field. Magnetic core 240 further enhances the magnetic field, improving heating efficiency. Cover 250 is made of ceramic, and shield 260 is made of a metal material, such as aluminum, iron, or an alloy thereof. Shield 260 has a magnetic permeability much greater than that of air. When an alternating current flows through coil 230, some magnetic flux lines pass perpendicularly or substantially perpendicularly through cover 250, while others pass through shield 260 without cutting into metal objects above it. During welding, the busbar 110 is placed on the cover plate 250, with a portion of the conductive ribbon 130 overlapping the busbar 110, while the remaining portion of the conductive ribbon 130 is positioned above the shielding plate 260. When the electromagnetic welding head 200 is operating, the shielding plate 260 acts to direct the magnetic flux lines through the cover plate 250, cutting only the busbar 110 and the overlapping portion of the conductive ribbon 130. This causes the busbar 110 and the overlapping portion of the conductive ribbon 130 to heat up rapidly and weld together. The portion of the conductive ribbon 130 above the shielding plate 260 is not cut by the magnetic flux lines and is not directly heated. Due to the heat conduction effect, the portion of the conductive ribbon 130 above the shielding plate 260 heats up more slowly. After the busbar 110 and the overlapping portion of the conductive ribbon 130 are welded, the portion of the conductive ribbon 130 above the shielding plate 260 remains relatively cool, preventing desoldering or over-soldering.

[0031] It should be noted that a shielding plate 260 is provided on one side of the cover plate 250, which is suitable for welding the busbars 110 located at both end areas of the photovoltaic module. A shielding plate 260 is provided on both sides of the cover plate 250, which is suitable for welding the busbars 110 located in the middle area or at both end areas of the photovoltaic module.

[0032] In the present invention, a plurality of grooves are provided at intervals on the cover plate 250 , and the grooves are used to balance the atmospheric pressure on both sides of the busbar 110 , thereby preventing the cover plate 250 and the busbar 110 from being difficult to separate due to mutual adsorption.

[0033] In the present invention, a first joint 221 is provided on the base 220, a first gas channel is provided inside the base 220, and a suction hole 251 is provided on the cover plate 250. The first joint 221, the first gas channel, and the suction hole 251 are sequentially connected. When air is extracted from the first joint 221, the suction hole 251 generates a suction force that keeps the busbar 110 stable throughout the welding process.

[0034] In the present invention, a second connector 222 is provided on the base 220, a second gas channel is provided within the base 220, and a blow hole 261 is provided on the shielding plate 260. The second connector 222, the second gas channel, and the blow hole 261 are sequentially connected. When gas is introduced into the second connector 222, the gas flows through the second gas channel and out of the blow hole 261 toward the connection area between the conductive tape 130 and the battery cell 120, preventing the temperature in this area from rising too quickly.

[0035] In the present invention, multiple magnetic cores 240 are spaced apart and wound around the same coil 230. The number of magnetic cores is adjusted as needed based on the length of the busbar 110, enabling a single electromagnetic welding head 200 to heat at least the busbar 110 corresponding to the length of one battery string. Furthermore, the long slot is provided with multiple recessed areas corresponding to the number of magnetic cores 240. The magnetic cores 240 are confined within these recessed areas, which help position the magnetic cores 240 and improve their installation accuracy.

[0036] like Figure 7 As shown, in the present invention, a filler 270 is provided in the long slot, and the coil 230 and the magnetic core 240 are wrapped and fixed by the filler 270. The filler 270 can be made of resin and is used to fill the space in the long slot not occupied by the coil 230 and the magnetic core 240, thereby fixing the coil 230 and the magnetic core 240 relative to the base 220.

[0037] like Figure 8 As shown, the utility model also provides a welding device, including a beam 300 and several electromagnetic welding heads 200, the bases 220 of the several electromagnetic welding heads 200 are fixed on the beam 300 in sequence, and the welding device can weld all the busbars 110 located in the middle area or the two end areas of the photovoltaic module at one time, which can improve the welding efficiency.

[0038] In the present invention, a cooling channel 310 is provided in the crossbeam 300 and is located directly below the base 220. A gaseous or liquid cooling medium can be introduced into the cooling channel 310 to reduce the temperature of the crossbeam 300, thereby reducing the temperature of the electromagnetic welding head 200 and accelerating the cooling of the electromagnetic welding head 200.

[0039] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not intended to limit the scope of the rights of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An electromagnetic welding head (200), characterized in that: The invention comprises a transformer assembly (210), a base (220), a coil (230), a magnetic core (240), a cover plate (250) and a shielding plate (260), wherein the transformer assembly (210) is electrically connected to the coil (230), the coil (230) and the magnetic core (240) are arranged in a long slot on the top of the base (220), and the coil (230) is wound on the magnetic core (240), the cover plate (250) and the shielding plate (260) are arranged on the top of the base (220), the cover plate (250) is located directly above the magnetic core (240), and the shielding plate (260) is distributed on one side or both sides of the cover plate (250).

2. The electromagnetic welding head (200) according to claim 1, characterized in that: A plurality of grooves are provided at intervals on the cover plate (250).

3. The electromagnetic welding head (200) according to claim 1, characterized in that: The base (220) is provided with a first joint (221), a first gas channel is provided inside the base (220), an adsorption hole (251) is provided on the cover plate (250), and the first joint (221), the first gas channel and the adsorption hole (251) are connected in sequence.

4. The electromagnetic welding head (200) according to claim 1, characterized in that: A second joint (222) is provided on the base (220), a second gas channel is provided inside the base (220), a blowing hole (261) is provided on the shielding plate (260), and the second joint (222), the second gas channel and the blowing hole (261) are connected in sequence.

5. The electromagnetic welding head (200) according to claim 4, characterized in that: A plurality of magnetic cores (240) are arranged at intervals and are wound around the same coil (230).

6. The electromagnetic welding head (200) according to claim 4, characterized in that: The long slot is provided with a plurality of recessed areas corresponding to the number of the magnetic cores (240), and the magnetic cores (240) are confined in the recessed areas.

7. The electromagnetic welding head (200) according to claim 1, characterized in that: A filler (270) is provided in the long slot, and the coil (230) and the magnetic core (240) are wrapped and fixed by the filler (270).

8. A welding device, characterized in that: It comprises a crossbeam (300) and a plurality of electromagnetic welding heads (200) according to any one of claims 1 to 7, wherein the bases (220) of the plurality of electromagnetic welding heads (200) are fixed on the crossbeam (300) in sequence.

9. The welding device according to claim 8, characterized in that: A cooling channel (310) is provided in the crossbeam (300), and the cooling channel (310) is located directly below the base (220).

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