CN216938921U

CN216938921U - Electromagnetic induction welding device for photovoltaic panel welding strip

Info

Publication number: CN216938921U
Application number: CN202220237209.XU
Authority: CN
Inventors: 郭绍伟; 马保华; 郑栋; 任天挺; 卢杰; 闫少鹏
Original assignee: Hangzhou Confirmware Technology Co ltd; Ningbo Weie Electronics Technology Ltd
Current assignee: Hangzhou Confirmware Technology Co ltd; Ningbo Weie Electronics Technology Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-07-12
Anticipated expiration: 2032-01-28

Abstract

The utility model discloses an electromagnetic induction welding device for a photovoltaic panel welding strip; the device comprises a welding head and a backing plate. The welding head carries out electromagnetic induction heating on the welding rod. The backing plate is used for supporting the welding rod. The welding head comprises a shell and a welding core. The core wires are arranged in the housing. The core wire comprises a magnetic core and a coil. The magnetic core comprises a bottom plate, a middle plate and two side plates. The middle plate and the two side plates are fixed on the bottom plate. The coil is wound on the middle plate and is positioned between the two side plates. In the working process, the coil can cover a plurality of grid lines below. According to the utility model, the strip-shaped magnetic core and the strip-shaped coil are arranged in the welding head, and the bus bars of the same type of battery pieces with different grid line numbers or intervals can be welded only by replacing different base plates, so that the application range of the welding head is enlarged, the number of the welding heads required for welding the battery pieces with different grid lines is reduced, and the cost is reduced.

Description

Electromagnetic induction welding device for photovoltaic panel welding strip

Technical Field

The utility model belongs to the technical field of photovoltaic confluence welding processing, and particularly relates to an electromagnetic induction welding device for a photovoltaic plate welding strip.

Background

In the production of photovoltaic panels, a current confluence output function is required. At present, grid lines are connected with photovoltaic cells in the industry, the grid lines are firstly connected with welding strips (bus bars), then the welding strips are connected with a junction box, and finally the lead of the junction box is output. The grid line and the photovoltaic cell piece need to be welded, and the grid line and the welding strip need to be welded. The industry has various welding modes such as hot air welding, electromagnetic welding, resistance welding and the like. Electromagnetic welding is currently the most energy-saving, most efficient, the smallest size, the shortest welding time and other advantages sought by the industry. However, the design difficulty of the electromagnetic welding structure is high, and the structure and the conversion efficiency directly influence the production efficiency. The existing electromagnetic welding equipment is provided with a plurality of coils to weld different welding spots, and is difficult to adapt to the welding task of bus bars of battery slices with different specifications (battery slices with different grid line numbers or intervals). In addition, the existing electromagnetic welding equipment has obvious magnetic flux leakage phenomenon and lower energy conversion efficiency.

Disclosure of Invention

The utility model aims to provide an electromagnetic induction welding device for a photovoltaic panel welding strip.

An electromagnetic induction welding device for photovoltaic plate welding strips comprises a welding head and a base plate. And the welding head performs electromagnetic induction heating on the welding strip. The backing plate is used for supporting the welding strip. The welding head comprises a shell and a welding core. The core wires are arranged in the housing. The core wire comprises a magnetic core and a coil. The magnetic core comprises a bottom plate, a middle plate and two side plates. The middle plate and the two side plates are fixed on the bottom plate. The coil is wound on the middle plate and is positioned between the two side plates. In the working process, the coil can cover a plurality of grid lines below.

Preferably, the shell is filled with heat-conducting glue.

Preferably, the bottom of the housing is provided with a heat insulating sheet. The heat insulation sheet is a ceramic sheet with a flat bottom surface.

Preferably, heat dissipation air passages are formed in the two sides of the shell.

Preferably, the top of the shell is provided with a control module; the control module provides alternating current signals for the coil in the welding core, and electromagnetic induction welding is achieved.

Preferably, the bottom plate, the middle plate and the two side plates are made of soft magnetic materials. The distances from the two side plates to the middle plate are equal. The thickness of the middle plate is less than or equal to the width of the welded welding strip.

Preferably, the number of turns of the coil is 8-12 turns.

Preferably, two side plates of the magnetic core are in contact with the inner wall of the shell.

Preferably, the length of the core wire corresponds to the width of the battery string, and the range of electromagnetic induction welding can cover all grid lines on the same battery string.

Preferably, in the welding process, the middle plate and the two side plates are perpendicular to the axis of the grid line on the battery string.

Preferably, a plurality of top columns are arranged on the base plate; the relative position between each top post corresponds with the relative position between each grid line on the battery piece.

Preferably, the top column is connected with the base plate in a sliding mode along the vertical direction, and a spring is arranged between the top column and the base plate.

Preferably, the top pillar is made of soft magnetic materials.

Preferably, the base plate further comprises a base and a suction cup: the pad seat is provided with a plurality of suckers for adsorbing the welding strips. The suction cup can be elevated above the top surface of the top pillar or below the top surface of the top pillar under the driving of the power element.

The utility model has the beneficial effects that:

1. according to the utility model, the strip-shaped magnetic core and the strip-shaped coil are arranged in the welding head, and the bus bars of the same type of battery pieces with different grid line numbers or intervals can be welded only by replacing different base plates, so that the application range of the welding head is enlarged, the number of the welding heads required for welding the battery pieces with the grid lines of different specifications is reduced, and the cost is reduced.

2. According to the utility model, the soft magnetic material is used as the top column, so that local rapid heating of a welding position can be realized, the condition that the whole welding strip is uniformly heated is avoided, and the efficiency of electromagnetic induction welding is obviously improved.

3. The welding core adopts a symmetrical magnetic circuit, and an effective working surface is increased, so that the requirement on alignment of a welding strip and a welding head is reduced, and the operation is very convenient.

4. The thickness of the middle plate used for the magnetic core is smaller than or equal to the width of the welding strip to be welded, the welding strip welding device belongs to small-size welding surface welding, can be used for welding various welding strips with different widths, avoids the situation of large quantity of magnetic leakage, enlarges the application range of the welding strip welding device, and avoids the situation that the welding strips with different specifications need to be matched with different welding heads.

5. The welding core is formed by winding ferrite and copper wires, so that copper loss and magnetic loss are reduced, and efficiency is improved. In addition, the voltage of the coil with 8-12 turns is lower, the requirement for leading wires is reduced, the requirements of a transformer for transformation and the like are not needed, and the electric operation is very convenient.

6. The bottom of a welding head is provided with a smooth ultrathin ceramic wafer or a pattern ultrathin ceramic wafer as a heat insulation sheet; the smooth ultrathin ceramic wafer can avoid heat loss and make the crater smoother; the patterned ultrathin ceramic wafer can avoid heat loss and make the craters more attractive. In addition, the use of the ceramic plates reduces surface wear and prolongs the service life.

7. The power of the photovoltaic bus bar electromagnetic welding device is more than two times compared with the existing photovoltaic bus bar electromagnetic welding device with the power of about 3KW per meter, so that the welding time is shortened, and the working efficiency is improved. Meanwhile, the utility model has high conversion efficiency and low heat productivity of the welding head, so that water cooling or wind cooling is not needed, and only natural cooling is needed, thereby reducing the requirements of working environment.

8. The heat dissipation air passages are arranged on the two sides of the shell, so that the heat dissipation area is increased, the heat dissipation is more effective, and the magnetic energy is more concentrated.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a bonding tool according to the present invention;

FIG. 3 is an internal view of a core wire of the present invention;

FIG. 4 is a schematic view of a core wire of the present invention;

FIG. 5 is a schematic view of the construction of the backing plate of the present invention;

fig. 6 is a working state diagram of the present invention.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1, an electromagnetic induction welding device for photovoltaic panel solder strip is used for welding grid lines on a battery string 13 and the solder strip together, and comprises a welding head 1 and a backing plate 2. The welding head 1 is used for generating an alternating magnetic field, so that the welding strip generates induction current to heat and weld. The backing plate 2 is used for supporting the solder ribbon and uses a soft magnetic material at the soldering position to reduce the magnetic resistance so that the soldering position of the solder ribbon is heated intensively. The welding head 1 and the backing plate 2 are driven by two position adjusting devices 12, respectively, so that the welding head 1 and the backing plate 2 can be accurately moved to the position to be welded. Two position adjustment devices 12 all adopt three-axis electric sliding tables.

As shown in fig. 2, 3 and 4, the soldering tip 1 includes a case 4, a heat insulating sheet 5, a core wire 6 and a heat conductive paste. The core wires 6 are arranged in an outer envelope 4 of aluminium. The gaps inside the shell 4 are filled with heat conducting glue, so that the assembly is more convenient and the heat dissipation is more efficient. Both sides of the shell 4 are provided with heat dissipation air passages 4-1; and a cover plate is arranged on the outer side of the heat dissipation air passage. The bottom of the housing 4 is provided with a heat insulating sheet 5. The heat insulation sheet 5 is made of ceramic material. Because the ceramic chip is hard and smooth, when the ceramic chip is pressed on a grid line with the diameter of 0.35mm, the ceramic chip can not contact with a welding strip positioned on the lower side of the grid line because of self deformation, and further, a welding scar generated on the welding strip is more attractive. In addition, the heat insulation sheet 5 at the bottom of the shell 4 can make the heat generated by electromagnetic induction welding difficult to transfer from the welding strip to the welding head 1, and avoid the over-high temperature of the welding head 1. The top of the shell 4 is provided with a control module 7; the control module 7 generates high frequency alternating current according to an externally output control signal and supplies the high frequency alternating current to the coil 6-1 in the core wire 6 to realize electromagnetic induction welding.

The core wire 6 includes a magnetic core and a coil 6-1. The longitudinal section of the magnetic core is in an E shape with an upward opening and comprises a bottom plate 6-2, a middle plate 6-3 and two side plates 6-4. The bottom plate 6-2 is horizontally arranged. The middle plate 6-3 is vertically arranged and fixed in the middle of the top surface of the bottom plate 6-2. The two side plates 6-4 are respectively fixed on two sides of the top surface of the bottom plate 6-2. The distances from the two side plates 6-4 to the middle plate 6-3 are equal. The bottom plate 6-2, the middle plate 6-3 and the two side plates 6-4 are made of soft magnetic materials with good comprehensive performance of heat conduction and magnetic conduction, and ferrite is specifically selected in the embodiment. The coil 6-1 is wound on the middle plate 6-3, and the axis direction of the whole coil 6-1 is vertically arranged. The coil 6-1 is positioned between the two side plates 6-4. Because the coil 6-1 is wrapped by the two side plates 6-4, the coil 6-1 has small magnetic leakage and high electromagnetic conversion efficiency. The wire wound with the coil 6-1 adopts a large strand wire woven by a plurality of strands of thin wires so as to reduce the magnetic leakage and the high-frequency effect on the coil 6-1 and improve the electromagnetic efficiency. The number of turns of the coil 6-1 is 8-12, so that the voltage of the coil 6-1 is lower, and the requirement on insulation is also lower; in addition, the coil 6-1 in the turn number range has relatively low requirement on the current of the wire, so that the requirement on the diameter of the wire is also low. Since the coil 6-1 is hidden inside the core of ferrite, the core wire 6 can be in direct contact with the inner wall of the case 4, thereby making the heat dissipation more efficient and the magnetic flux leakage less. The width of the middle plate 6-3 is smaller than the width of the welding strip, and the value in the embodiment is equal to the width k of the narrowest welding strip to be welded; the width of the magnetic core (the distance between the back side surfaces of the two side plates 6-4) is less than or equal to the distance between the battery pieces on the two sides of the position where the welding strip is located (in this embodiment, the value is 4 k); the length of the core wire 6 is equal to the width of the battery string 13, and the alternating magnetic field generated by the coil 6-1 can cover each welding position on the welding strip. Because the welding strip 3 and the grid line are both made of high-heat-conductivity and high-electric-conductivity materials, the welding head 1 can weld the welding strip 3 and the grid line in an electromagnetic induction mode.

Because the battery piece has positive negative pole, and conduct electricity between homopolar grid line, so weld and take 3, grid line, can form annular conductive loop between the battery piece. If electromagnetic changes pass through the loop, electromotive force is generated to generate heat. The heating amount is high to a certain degree, and the grid line can be burnt. Aiming at the situation, the magnetic core with the E-shaped structure is adopted, so that the magnetic flux of the two side plates 6-4 flows into the magnetic flux of the middle plate 6-3 or the magnetic flux of the middle plate 6-3 flows into the two side plates 6-4; as long as the central symmetry line of the bottom surface of the middle plate 6-3 is located between the vertical planes where the edges of the two sides of the welding strip 3 are located, the magnetic field change in the annular loops at the two sides of the welding strip 3 can be offset by the magnetic field change generated between the middle plate 6-3 and the side plate 6-4 at the corresponding side; therefore, electromotive force cannot be generated in the annular loop, and the situation that the grid line is blown is avoided. In this case, the position of the welding strip 3 is allowed to be shifted by half the width of the welding strip 3, so that the requirement for the alignment accuracy between the welding strip 3 and the welding head 1 is low and the failure is not easy to occur.

As shown in fig. 5, the tie plate 2 includes a pad base 8, a suction cup 9, an air cylinder 10, and a top post 11: the pad seat 8 is in a strip shape, and the shape of the top surface corresponds to the shape of the bottom surface of the welding head 1. The two ends of the top surface of the cushion seat 8 are provided with abdicating holes in a centering way. The two cylinders 10 are respectively fixed at two ends of the bottom surface of the cushion seat 8, and the piston rods are arranged upwards and fixed with the suckers 9. The two suckers 9 penetrate through the two yielding holes respectively, are upward in opening and are used for adsorbing and fixing the welding strip. The top surface of backing plate 2 is seted up a plurality of mounting holes of arranging in proper order along self length direction. Each mounting hole and two abdicating holes are on the same straight line. The positions of the mounting holes correspond to the welding positions (positions of the grid lines) on the welded battery string 13. Each mounting hole is connected with a top column 11 in a sliding way. A spring is arranged between the bottom surface of the top column 11 and the bottom surface of the mounting hole.

The suction cup 9 has an upper limit position and a lower limit position pushed by the cylinder 10. When the suction cup 9 is at the upper limit position, the top opening of the suction cup 9 is higher than the top surface of each top column 11; when the suction cup 9 is at the lower limit position, the top opening of the suction cup 9 is lower than the top surface of each top column 11; the top pillars 11 can move downward when pressed by the solder ribbon 3, thereby ensuring that each top pillar 11 can be brought into contact with each of the different soldering positions of the solder ribbon 3. In addition, the pressure of the spring can make each welding position of the welding strip 3 closely contact with the corresponding grid line, and the welding positions have pressure with each other. The top column 11 is made of soft magnetic material, specifically ferrite in this embodiment, and can reduce the magnetic flux below the welding position of the welding strip 3, so that the welding position of the welding strip 3 can be heated in a centralized manner, the electromagnetic welding efficiency is improved, and the overall heating value is reduced. Because the welding head 1 is in a strip shape and only one coil 6-1 which is also in the strip shape is arranged inside the welding head, the welding operation of welding the strip 3 can be realized by the battery strings 13 with different grid numbers or different grid line intervals only by matching with the top columns 11 with different numbers or intervals. The top surface of fore-set 11 is provided with the insulating layer for avoid welding the heat on taking along fore-set 11 and run off fast, in order to improve the welding effect.

As shown in fig. 6, the working principle of the present invention is as follows:

step one, respectively installing welding heads 1 and backing plates 2 with corresponding quantity on two position adjusting devices 12 according to the quantity of the welded battery strings 13; the solder strip is placed on the suction cups 9 of the respective backing plates 2 by means of a solder strip feeding device or manually. The suction cup 9 sucks the solder strip under the action of an external vacuum source. At this time, the solder ribbon is positioned above each of the top pillars 11.

Secondly, a plurality of battery strings 13 arranged side by side are transported to a target position through a battery string 13 conveying device and lifted by a battery string 13 lifting device; each welding head 1 is driven by the corresponding position adjusting device 12 to move to a position right above the position where the grid lines on each battery string 13 are welded. The backing plates 2 are driven by the corresponding position adjusting devices 12 to move to positions right below the positions where grid lines on the battery strings 13 are welded, and the top pillars 11 on the backing plates 2 are aligned with the grid lines on the battery pieces respectively.

And step three, stopping air suction of each sucker 9, no longer adsorbing the welding strip, and descending by driving of the air cylinder 10. The solder strip is supported on each of the top pillars 11.

And step four, lifting the battery string 13 by the lifting device to put the battery string 13 down, so that each grid line is in contact with the corresponding welding strip 3.

And step five, each welding head 1 is driven to be lowered by the corresponding position adjusting device 12, the welding heads are extruded at the welded positions of the corresponding grid lines, and each welding strip 3 is extruded to drive the ejection column 11 to be lowered, so that the spring applies spring force to the welding strips 3 and the grid lines through the ejection column 11. The solder strip 3 is in close contact with the grid line.

And step six, the coil 6-1 in each welding head 1 is electrified with alternating current, so that the welding strip 3 is heated under the action of electromagnetic induction and is welded with the grid line. At this time, the top pillar 11 made of soft magnetic material reduces the magnetic resistance of each welding position on the welding strip 3, so that the magnetic flux of each welding position on the welding strip 3 is more intense relative to other positions, thereby improving the heat productivity of the welding position, reducing the heat productivity of non-welding positions, improving the electromagnetic welding efficiency, and reducing the overall heat productivity.

Example 2

This example differs from example 1 in that: the top column 11 is made of heat insulating materials; so as to reduce the heat loss of the welding position of the welding strip 3 and improve the energy utilization rate and the welding speed.

Claims

1. An electromagnetic induction welding device for a photovoltaic plate welding strip comprises a welding head (1) and a backing plate (2); the method is characterized in that: the welding head (1) performs electromagnetic induction heating on the welding strip; the backing plate (2) is used for supporting the welding strip; the welding head (1) comprises a shell (4) and a core wire (6); the core wires (6) are arranged in the shell (4); the welding core (6) comprises a magnetic core and a coil (6-1); the magnetic core comprises a bottom plate (6-2), a middle plate (6-3) and two side plates (6-4); the middle plate (6-3) and the two side plates (6-4) are fixed on the bottom plate (6-2); the coil (6-1) is wound on the middle plate (6-3) and positioned between the two side plates (6-4); in the working process, the coil (6-1) can cover a plurality of grid lines below.

2. An electromagnetic induction welding device for photovoltaic panel solder strips as claimed in claim 1, characterized in that: and a heat insulation sheet (5) is arranged at the bottom of the shell (4).

3. An electromagnetic induction welding device for photovoltaic panel solder strips as claimed in claim 2, characterized in that: the heat insulation sheet (5) adopts a ceramic sheet with a flat bottom surface or patterns.

4. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: and heat dissipation air passages (4-1) are formed in two sides of the shell (4).

5. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: the top of the shell (4) is provided with a control module (7); the control module (7) provides alternating current signals for the coil (6-1) in the welding core (6) to realize electromagnetic induction welding.

6. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: the bottom plate (6-2), the middle plate (6-3) and the two side plates (6-4) are made of soft magnetic materials; the distances from the two side plates (6-4) to the middle plate (6-3) are equal; the thickness of the middle plate is less than or equal to the width of the welded welding strip.

7. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: the number of turns of the coil (6-1) is 8-12.

8. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: two side plates (6-4) in the magnetic core are contacted with the inner wall of the shell (4).

9. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: the length of the welding core (6) corresponds to the width of the battery string (13), and the range of electromagnetic induction welding can cover all grid lines on the same battery string.

10. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: in the welding process, the middle plate (6-3) and the two side plates (6-4) are perpendicular to the axis of the grid line on the battery string.

11. An electromagnetic induction welding device for photovoltaic panel solder strips as claimed in claim 1, characterized in that: a plurality of top columns (11) are arranged on the base plate (2); the relative position between each top post corresponds with the relative position between each grid line on the battery piece.

12. An electromagnetic induction welding device for photovoltaic panel solder strips as claimed in claim 11, characterized in that: the top column (11) is connected with the backing plate (2) in a sliding mode in the vertical direction, and a spring is arranged between the top column (11) and the backing plate (2).

13. An electromagnetic induction welding device for photovoltaic panel solder strips according to claim 11 or 12, characterized in that: the top column (11) is made of soft magnetic materials.

14. An electromagnetic induction welding device for photovoltaic panel solder strips as claimed in claim 13, characterized in that: the top surface of the top column is provided with a heat insulation layer.

15. An electromagnetic induction welding device for photovoltaic panel solder strips according to claim 11 or 12, characterized in that: the base plate (2) further comprises a base (8) and a sucker (9): a plurality of suckers (9) for adsorbing welding strips are arranged on the pad seat (8); the suction cup (9) can be lifted to be higher than the top surface of the top column or lower than the top surface of the top column under the driving of the power element.

16. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: the width of the middle plate (6-3) is less than that of the welding strip; the width of the magnetic core is smaller than or equal to the distance between the battery pieces on two sides of the position where the welding strip is located.

17. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: in the welding process, the central symmetry line of the bottom surface of the middle plate (6-3) is positioned between the vertical planes of the edges of the two sides of the welding strip (3), so that the magnetic field change of a ring-shaped loop formed by the welding strip, the grid line and the battery piece is counteracted.

18. An electromagnetic induction welding device for photovoltaic panel welding strips according to claim 1, 2 or 3, characterized in that: and the shell (4) is filled with heat-conducting glue.