CN110270751B - Welding device and welding method - Google Patents

Welding device and welding method Download PDF

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Publication number
CN110270751B
CN110270751B CN201810210614.0A CN201810210614A CN110270751B CN 110270751 B CN110270751 B CN 110270751B CN 201810210614 A CN201810210614 A CN 201810210614A CN 110270751 B CN110270751 B CN 110270751B
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China
Prior art keywords
welding
welding machine
machine
flange
shaped connecting
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CN201810210614.0A
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CN110270751A (en
Inventor
李旭阳
马兴华
杨从明
杨俊义
丁易
王佳贤
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Microvast Power Systems Huzhou Co Ltd
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Microvast Power Systems Huzhou Co Ltd
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Priority to CN201810210614.0A priority Critical patent/CN110270751B/en
Publication of CN110270751A publication Critical patent/CN110270751A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/26—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
    • B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
    • B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
    • B23K37/047—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work moving work to adjust its position between soldering, welding or cutting steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B23K2101/38—Conductors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention provides a welding device which comprises a first welding machine, a second welding machine and a welding clamp for fixing the welding parts, wherein the welding clamp is arranged between the first welding machine and the second welding machine, and the first welding machine and the second welding machine are ultrasonic welding machines; the first welding machine and the second welding machine respectively adjust the relative positions among the welding head, the welding seat and the welding part; the welding fixture is connected with the driving device, and the welding part is driven by the driving device to do linear and/or rotary motion. The invention also provides a welding method using the welding device, which enables the welding clamp to move in the vertical direction and the welding clamp to rotate between the first welding machine and the second welding machine. The invention solves the problem of complex pretreatment and welding procedures of the battery core and improves the working efficiency.

Description

Welding device and welding method
Technical Field
The present invention relates to a welding apparatus and a welding method.
Background
At present, when welding device welds a welding piece, need be with the fixed centre gripping of a welding piece between bonding tool and welding seat, when different positions exist a plurality of welding points on the welding piece, need a plurality of stations, and need carry out repeated fixed, inefficiency to the welding piece.
In traditional battery module welding process, because two utmost point ears materials are different, at least one utmost point ear can't be directly with the busbar welded fastening with the mode welded fastening of laser welding (laser welding can't weld the material that the fusing point is different), consequently need another kind of metal of switching in order to realize the laser welding of two utmost point ears and busbar on at least one utmost point ear. In the process, a switching procedure is added, so that the pretreatment procedure of the battery cell is complex, the cost is increased, the product quality problem caused by switching is easy to generate, and the reliability is reduced; and the detection mode of the laser welding joint has certain damage.
The common ultrasonic welding machine can only weld a single position, and when part of the welding part has larger rigidity, the ultrasonic welding machine can weld the welding part in a direction, and at the moment, the welding seat of the ultrasonic welding machine can only be positioned on one side of the welding part with larger rigidity. Therefore, when a part of the welding part has higher rigidity and more welding positions, the welding efficiency of the common ultrasonic welding machine is difficult to improve.
Disclosure of Invention
The invention discloses a welding device which comprises a first welding machine, a second welding machine and a welding fixture for fixing a welding part, wherein the welding fixture is arranged between the first welding machine and the second welding machine, the welding part comprises a battery module, the battery module is formed by stacking battery cells along the thickness direction of the battery cells, and the first welding machine and the second welding machine are ultrasonic welding machines; the first welding machine at least comprises a welding head and a welding seat, the second welding machine at least comprises a welding head and a welding seat, and the first welding machine and the second welding machine respectively adjust the relative positions among the welding head, the welding seat and the welding part; the welding fixture is connected with the driving device, so that the welding part can do linear and/or rotary motion under the driving of the driving device.
The first welding machine and the second welding machine respectively adjust the relative positions among the welding heads, the welding seats and the welding parts, so that the welding heads and the welding seats of the two welding machines can clamp the welding parts or loosen the clamping of the welding parts.
The welding part is driven by the driving device to do linear and/or rotary motion, so that the welding machine can conveniently weld a plurality of positions of the welding part at the same station, and the working efficiency is improved.
In one embodiment of the invention, the welding device further comprises a first workbench and a second workbench, the first workbench and the second workbench are arranged on the frame, a first sliding rail is arranged on the upper surface of the first workbench, a second sliding rail is arranged on the upper surface of the second workbench, the first welding machine is arranged on the first workbench, the second welding machine is arranged on the second workbench, the welding fixture is arranged between the first workbench and the second workbench, and the first welding machine and the second welding machine respectively use the first sliding rail and the second sliding rail to change the horizontal distance between the first welding machine and the welding fixture.
In one embodiment of the invention, the first welder and the second welder weld opposite faces of the weldment, respectively.
The first welding machine and the second welding machine respectively weld two opposite surfaces of the welding part, so that different positions of the welding part can be conveniently welded at the same time, and the welding efficiency is improved.
In one embodiment of the invention, the first welder and the second welder weld the weldment simultaneously.
In one embodiment of the present invention, the driving device includes an air cylinder and a motor, the air cylinder drives the welding fixture to move axially, and the motor drives the welding fixture to rotate, so that the positions of two opposite surfaces of the welding part are interchanged.
The axial direction refers to the axial direction of the air cylinder, and the axial direction of the air cylinder is the same as the stacking direction of the battery cells in the welding part.
In one embodiment of the invention, the motor drives the weldment to rotate, the axis of rotation of the weldment being perpendicular to the horizontal plane.
In one embodiment of the invention, the motor drives the weldment to rotate, the axis of rotation of the weldment being parallel to the horizontal plane.
In one embodiment of the invention, the welding jig is connected to a cylinder, which drives the welding jig in a vertical direction.
The cylinder setting is in welding jig's top or below, and welding jig moves along vertical direction under the effect of cylinder.
One side of welding jig is provided with the support frame, and the piston rod and the support frame of cylinder are connected, and the support frame can be at vertical direction reciprocating motion under the effect of cylinder, and welding jig is connected with the support frame and along with the support frame reciprocating motion in vertical direction.
The welding fixture is connected with the motor, and the motor drives the welding fixture to enable the positions of two opposite surfaces of the welding part to be interchanged.
In one embodiment of the present invention, the motor is disposed at one side of the welding jig, and a rotation shaft of the motor is connected to the welding jig such that the rotation shaft of the welded member is parallel to the horizontal plane.
The motor is arranged on the support frame and can reciprocate along with the support frame in the vertical direction, and the rotating shaft of the motor drives the welding fixture and the welding part fixed by the welding fixture to rotate.
In one embodiment of the invention, the motor is arranged above or below the welding fixture, and the rotating shaft of the motor is connected with the welding fixture, so that the rotating shaft of the welding part is vertical to the horizontal plane.
The rotating shaft of the motor drives the welding fixture and the welding part fixed by the welding fixture to rotate, the position of the welding part is changed, and other parts of the welding part can be welded on the premise of not changing the relative positions of the first welding machine/the second welding machine and the first workbench/the second workbench.
The motor is arranged on one side, close to the welding fixture, of the support frame above (below) the motor, the cylinder is arranged above (below) the support frame, and a piston rod of the cylinder is connected with the support frame.
A piston rod of the air cylinder drives the support frame, a motor above (below) the support frame and the welding clamp to move up and down; the rotating shaft of the motor drives the welding fixture to rotate.
In one embodiment of the invention, the welding head of the first welding machine and the welding head of the second welding machine are arranged on the same side of the respective welding holder.
For example, when the first and second work tables are horizontally mounted, the horn of the first welder and the horn of the second welder are respectively located above the respective welding seats, or the horn of the first welder and the horn of the second welder are respectively located below the respective welding seats.
In one embodiment of the invention, the welding head of the first welding machine and the welding head of the second welding machine are arranged on opposite sides of the respective welding seat.
For example, when the first and second tables are mounted horizontally, the horn of the first welder is positioned above the anvil and the horn of the second welder is positioned below the anvil.
The invention has the beneficial effects that:
the welding device provided by the invention can directly and simultaneously weld different parts of a welding part by using the ultrasonic welding machine, thereby simplifying the operation procedure of welding, improving the welding efficiency and reducing the cost; the welding piece can be welded at the same station without changing the position of the workbench along with the vertical and rotary motion of the welding fixture, so that the placing space of the equipment is saved, and the working efficiency is improved.
The invention also provides a welding method, which utilizes the welding device and comprises the following steps:
a. fixing a welding part in a welding fixture, wherein the welding part comprises a battery module and a U-shaped connecting sheet, the battery module is formed by stacking a plurality of battery cells, and the U-shaped connecting sheet is arranged between the lugs of adjacent battery cells;
b. adjusting the positions of a welding head and a welding seat of the first welding machine and the second welding machine respectively to enable the welding head and the welding seat of the first welding machine to clamp at least one lug on one side of the battery module and a flange of a U-shaped connecting sheet adjacent to the lug, and welding the lug and the flange of the U-shaped connecting sheet; a welding head and a welding seat of a second welding machine clamp at least one lug on the other side of the battery module and a flange of the U-shaped connecting sheet adjacent to the lug, and the lug is welded with the flange of the U-shaped connecting sheet;
c. adjusting the distance between the welding head and the welding seat of each of the first welding machine and the second welding machine, and adjusting the distance between each of the first welding machine and the second welding machine and the welding part, so that the welding part is separated from the corresponding welding head and welding seat;
d. and c, driving the welding piece to rotate between the first welding machine and the second welding machine by the driving device, so that the positions of two opposite surfaces of the battery module are exchanged, and repeating the step b and the step c.
The battery cell is a soft-package battery cell, the U-shaped connecting piece comprises a connecting body and a first flange and a second flange which are positioned at two opposite ends of the connecting body, and the extending directions of the first flange and the second flange are the same; the first flange and the second flange extend in the direction away from the battery module.
As an embodiment, the positive and negative electrode lugs of the soft-package battery cell in the battery module are respectively located at two opposite ends of the soft-package battery cell, after the soft-package battery cell is stacked into the module, the plurality of U-shaped connecting sheets are respectively arranged between the adjacent electrode lugs at two opposite sides of the battery module, and series-parallel connection is realized between the soft-package battery cells through the U-shaped connecting sheets.
The first flange and the second flange of the same U-shaped connecting piece are respectively connected with different lugs on the same side of the battery module, a single first flange or a single second flange can correspond to a plurality of lugs, and the single first flange or the single second flange and the plurality of lugs are welded together by using the welding method provided by the invention.
In one embodiment of the present invention, the step c further comprises a step c1 of driving the welding member to move linearly by the driving device, so that the welding member moves linearly relative to the first welding machine and/or the second welding machine, and then repeating the steps b and c.
The cylinder can be arranged above or below the welding fixture, and a piston rod of the cylinder moves up and down along with the movement of the piston and drives the welding fixture and a welding part fixed by the welding fixture to move up and down.
After the welding part moves, the flange of the other U-shaped connecting piece and the lug corresponding to the flange are clamped by the welding head and the welding seat of the first welding machine and are welded together; and simultaneously, the welding head and the welding seat of the second welding machine clamp the flange of the other U-shaped connecting sheet on the other side of the battery module and the lug corresponding to the flange, and the flange and the lug are welded together.
In the step d, the rotating shaft of the welding part is parallel to the horizontal plane, and the rotating angle is 180 degrees.
Laminate polymer core piles up in the thickness direction among the battery module to at least a slice laminate polymer core is parallel with the horizontal plane, and the first edge of a wing is located second edge of a wing top, and after welding jig rotated 180, the first edge of a wing was located second edge of a wing below.
In one embodiment of the invention, the welding head of the first welding machine and the welding head of the second welding machine are both arranged above the respective welding seats, the laminate polymer cells are stacked in the thickness direction, and the first flange is located above the second flange. A welding head and a welding seat of a first welding machine clamp and weld a first flange of a U-shaped connecting sheet to be welded and a lug corresponding to the first flange; a welding head and a welding seat of a second welding machine clamp and weld a first flange of a U-shaped connecting sheet to be welded on the other side of the battery module and a lug corresponding to the first flange; the lug is welded with the upper surface of the first flange.
The rotating shaft of the battery module is parallel to the horizontal plane and rotates 180 degrees, so that the positions of two opposite surfaces of a welding part are exchanged, at the moment, the first flange is positioned below the second flange, and the welding head and the welding seat of the first welding machine clamp the second flange of a U-shaped connecting piece to be welded and a lug corresponding to the second flange and weld the second flange and the lug together; simultaneously, a welding head and a welding seat of a second welding machine clamp a second flange of a U-shaped connecting sheet on the other side of the battery module and a lug corresponding to the second flange, and the welding head and the welding seat are welded together; finally realize the series-parallel connection between the soft-packaged electric core, rotatory back, utmost point ear is in fact in the same place with the upper surface welding on the second edge of a wing.
In one embodiment of the invention, the welding head of the first welding machine and the welding head of the second welding machine are both arranged below the respective welding seats, the laminate polymer cells are stacked in the vertical direction, and the first flange is located above the second flange. A welding head and a welding seat of a first welding machine clamp and weld a second flange of a U-shaped connecting sheet to be welded and a lug corresponding to the second flange; a welding head and a welding seat of a second welding machine clamp and weld a second flange of a U-shaped connecting sheet to be welded on the other side of the battery module and a lug corresponding to the second flange; and the lug is welded with the lower surface of the second flange.
The rotating shaft of the welding part is parallel to the horizontal plane and rotates 180 degrees, so that the positions of two opposite surfaces of the welding part are exchanged, at the moment, the first flange is positioned below the second flange, and the welding head and the welding seat of the first welding machine clamp and weld the first flange of the U-shaped connecting piece to be welded and the lug corresponding to the first flange together; simultaneously, a welding head and a welding seat of a second welding machine clamp and weld a first flange of a U-shaped connecting sheet on the other side of the battery module and a lug corresponding to the first flange; finally realize the series-parallel connection between soft-packaged electrical core, rotatory back, utmost point ear is in fact in the same place with the lower surface welding on first edge of a wing.
In one embodiment of the invention, the welding head of the first welding machine is arranged above the welding seat thereof, and the welding head of the second welding machine is arranged below the welding seat thereof; in the step d, the rotation axis of the battery module is perpendicular to the horizontal plane and rotates 180 degrees.
Soft packet of electric core piles up in vertical direction, and the first edge of a wing is located second edge of a wing top. A welding head and a welding seat of a first welding machine clamp a first flange of a U-shaped connecting sheet to be welded and a lug corresponding to the first flange; and a welding head and a welding seat of the second welding machine clamp a second flange of the U-shaped connecting sheet on the other side of the battery module and a lug corresponding to the second flange. The upper surface on the first edge of a wing with this first edge of a wing corresponding utmost point ear welding together, the lower surface on the second edge of a wing with this second edge of a wing corresponding utmost point ear welding together.
The rotating shaft of the welding part is vertical to the horizontal plane and rotates 180 degrees, the first flange is still positioned above the second flange, and the welding head and the welding base of the first welding machine clamp the first flange of the other U-shaped connecting piece to be welded and a lug corresponding to the first flange to weld the first flange and the lug together; a welding head and a welding seat of a second welding machine clamp a second flange of another U-shaped connecting sheet at the other side of the battery module and a lug corresponding to the second flange and weld the flanges together; and finally, series-parallel connection between the soft-package cells is realized.
In one embodiment of the present invention, two opposite end surfaces of the battery cell are provided with tabs.
In one embodiment of the invention, when the first welding machine and the second welding machine clamp the welding part, the welding head is in contact with the pole lug of the soft package battery cell, and the welding base is in contact with the flange of the U-shaped connecting sheet. The U-shaped connecting sheet is thicker and is contacted with the welding seat due to the overcurrent requirement, and the lug is thinner and is contacted with the welding head, so that the welding between the lug and the welding seat is facilitated.
The invention has the beneficial effects that:
the welding method provided by the invention can directly weld different materials together by using the ultrasonic welding machine, and the lugs of different materials are welded together with the U-shaped connecting sheet, so that the pretreatment process of the battery cell is simplified, and the cost is reduced; the first welding machine and the second welding machine simultaneously weld two opposite side surfaces of the battery module, so that the welding efficiency is improved; the welding piece completes the welding between the lug and the U-shaped connecting piece at the same station along with the up-and-down and rotating motion of the welding fixture, thereby saving the working space and improving the working efficiency.
Drawings
Fig. 1 is an isometric view of a welding apparatus.
Fig. 2 is an enlarged schematic view of position a in fig. 1.
Figure 3 is an isometric illustration of a weld.
Fig. 4 is an enlarged schematic view of position B in fig. 3.
Fig. 5 is a front view schematically illustrating a welding apparatus.
Fig. 6 is an enlarged schematic view of position C in fig. 5.
Fig. 7 is an enlarged schematic view of position D in fig. 5.
Fig. 8 is a left side view of the welding apparatus.
Description of reference numerals:
1: first welding machine, 11: first stage, 2: second welding machine, 21: second stage, 3: welding jig, 4: a welding part, 40: battery module, 41: tab, 42: u-shaped connecting piece, 420: connector, 421: first flange, 422: second flange, 5: bonding head, 6: welding seat, 7: a cylinder, 8: motor, 81: rotating shaft, 9: a support frame.
Detailed Description
The following specific examples describe the present invention in detail, however, the present invention is not limited to the following examples.
Example 1:
as shown in fig. 1 and 2, the present embodiment provides a welding apparatus, including a first welding machine 1, a second welding machine 2, and a welding fixture 3 for fixing a welding member 4, where the welding fixture 3 and the welding member 4 are disposed between the first welding machine 1 and the second welding machine 2; the first welding machine 1 and the second welding machine 2 are respectively arranged on a first workbench 11 and a second workbench 21, and the first workbench 11 and the second workbench 21 are horizontally arranged on the rack; the first workbench 11 and the second workbench 21 are respectively provided with a first slide rail and a second slide rail, the first welding machine 1 can move along the first slide rail, the second welding machine 2 can move along the second slide rail, and the first welding machine 1 and the second welding machine 2 respectively change the horizontal distance between the first welding machine 1 and the welding part 4 by utilizing the first slide rail and the second slide rail.
The first welding machine 1 and the second welding machine 2 are ultrasonic welding machines; the first welding machine 1 and the second welding machine 2 can respectively adjust the relative positions of the welding head 5, the welding seat 6 and the welding part 4; the first welding machine 1 and the second welding machine 2 weld opposite sides of the weld member 4 at the same time.
As shown in fig. 1, fig. 3 and fig. 4, the weldment 4 includes a battery module 40 and a U-shaped connecting sheet 42, the battery module 40 is formed by stacking a plurality of flexible package battery cells, and the plurality of U-shaped connecting sheets 42 are respectively arranged between tabs 41 of adjacent flexible package battery cells to realize series-parallel connection between the flexible package battery cells. The U-shaped connecting piece 42 comprises a connecting body 420 and a first flange 421 and a second flange 422 which are positioned at two opposite sides of the connecting body 420 and extend in the same direction; first flange 421 is located above second flange 422, and first flange 421 and second flange 422 extend in a direction away from battery module 40. The outsides of the first and second flanges 421 and 422 contact the tab 41.
As shown in fig. 4, 5, 6 and 7, the welding heads 5 of the first welder 1 and the welding heads 5 of the second welder 2 are both arranged above the respective welding seats 6; when the first welding machine 1 and the second welding machine 2 weld the welding parts 4 (the welding head 5 and the welding base 6 clamp the flange of the tab 41 and the U-shaped connecting piece 42), the welding head 5 is in contact with the tab 41, and the welding base 6 is in contact with the flange of the U-shaped connecting piece 42.
Specifically, the welding head 5 and the welding base 6 of the first welding machine 1 clamp and weld a first flange 421 of a U-shaped connecting piece 42 to be welded and tabs 41 corresponding to the first flange 421 (in this embodiment, the number of the tabs 41 corresponding to the first flange 421 is 3), together; meanwhile, the welding head 5 and the welding base 6 of the second welding machine 2 clamp and weld the first flange 421 of one U-shaped connecting piece 42 to be welded and the tabs 41 corresponding to the first flange 421 (in the present embodiment, the number of the tabs 41 corresponding to the first flange 421 is 3) on the other side of the battery module.
As shown in fig. 5, 8, the welding jig 3 is movable in the vertical direction; a cylinder 7 is arranged above the welding fixture 3, the cylinder 7 is fixed on the rack, and the welding fixture 3 moves in the vertical direction under the action of the cylinder 7. Specifically, one side of welding jig 3 is provided with support frame 9, and the piston rod of cylinder 7 is connected with support frame 9, and support frame 9 can be reciprocating motion in vertical direction under the effect of cylinder 7, and welding jig 3 passes through motor 8 with support frame 9 to be connected, and motor 8 and welding jig 3 are reciprocating motion in vertical direction along with support frame 9.
As shown in fig. 4, 5, 6 and 8, after the welding member 4 moves, the welding head 5 and the welding base 6 of the first welding machine 1 clamp the first flange 421 of the other U-shaped connecting piece 42 and the tab 41 corresponding to the first flange 421, and weld the first flange 421 and the tab together; meanwhile, the welding head 5 and the welding seat 6 of the second welding machine 2 clamp and weld the first flange 421 of the other to-be-welded U-shaped connecting piece 42 on the other side of the battery module and the tab 41 corresponding to the first flange 421.
The welding fixture 3 can rotate between the first welding machine 1 and the second welding machine 2 under the driving of the motor 8, so that the positions of the upper surface and the lower surface of the welding part 4 are interchanged; one side of welding jig 3 is provided with motor 8, and motor 8 is fixed on support frame 9, and the pivot 81 of motor 8 is connected with welding jig 3, makes welding jig 3 and welding 4 synchronous revolution (the rotation axis of welding 4 is parallel with the horizontal plane).
The welding part 4 rotates 180 degrees (the rotation axis of the welding part is parallel to the horizontal plane), so that the positions of the upper surface and the lower surface of the welding part 4 are exchanged, after the rotation, the first flange 421 is positioned below the second flange 422, and the welding head 5 and the welding base 6 of the first welding machine 1 clamp the second flange 422 of a U-shaped connecting piece 42 to be welded and the tabs 41 corresponding to the second flange 422 (in the embodiment, the number of the tabs 41 corresponding to the second flange 422 is 3), and weld the tabs together; meanwhile, the welding head 5 and the welding holder 6 of the second welding machine 2 clamp and weld the second flange 422 of one U-shaped connecting piece 42 on the other side of the battery module and the tabs 41 corresponding to the second flange 422 (in this embodiment, the number of the tabs 41 corresponding to the second flange 422 is 3) together; and finally, series and parallel connection between the soft-package battery cells is realized, and after rotation, the upper surface of the second wing edge 422 is actually welded with the tab 41.
Example 2:
as shown in fig. 1 and fig. 2, the present embodiment provides a welding device, which includes a first welding machine 1, a second welding machine 2 and a welding fixture 3 for fixing a welding part 4, wherein the welding fixture 3 is internally fixed with the welding part 4, the welding fixture 3 and the welding part 4 fixed by the welding fixture are arranged between the first welding machine 1 and the second welding machine 2, the first welding machine 1 and the second welding machine 2 are respectively arranged on a first workbench 11 and a second workbench 21, and the first workbench 11 and the second workbench 21 are horizontally arranged on a machine frame; the first workbench 11 and the second workbench 21 are respectively provided with a first slide rail and a second slide rail, the first welding machine 1 can move along the first slide rail, the second welding machine 2 can move along the second slide rail, and the first welding machine 1 and the second welding machine 2 respectively change the horizontal distance between the first welding machine 1 and the welding part 4 by utilizing the first slide rail and the second slide rail.
The first welding machine 1 and the second welding machine 2 are ultrasonic welding machines; the first welding machine 1 and the second welding machine 2 can respectively adjust the distance between the welding head 5, the welding seat 6 and the welding part 4; the first welding machine 1 and the second welding machine 2 weld opposite sides of the weld member 4 at the same time.
As shown in fig. 1, fig. 3 and fig. 4, the weldment 4 includes a battery module 40 and a U-shaped connecting sheet 42, the battery module 40 is formed by stacking a plurality of flexible package battery cells, and the plurality of U-shaped connecting sheets 42 are respectively arranged between tabs 41 of adjacent flexible package battery cells to realize series-parallel connection between the flexible package battery cells. The U-shaped connecting piece 42 comprises a connecting body 420 and a first flange 421 and a second flange 422 which are positioned at two opposite sides of the connecting body 420 and extend in the same direction; first flange 421 is located above second flange 422, and first flange 421 and second flange 422 extend in a direction away from battery module 40. The outsides of the first and second flanges 421 and 422 contact the tab 41.
The welding head 5 of the first welding machine 1 is arranged above the welding seat 6 thereof; the welding head 5 of the second welding machine 2 is arranged below its welding seat 6 (not shown in the figures). When the first welding machine 1 and the second welding machine 2 weld the welding parts 4 (the welding head 5 and the welding base 6 clamp the flange of the tab 41 and the U-shaped connecting piece 42), the welding head 5 is in contact with the tab 41, and the welding base 6 is in contact with the flange of the U-shaped connecting piece 42.
The welding fixture 3 can move along the vertical direction; the welding jig 3 is rotatable between the first welding machine 1 and the second welding machine 2 to interchange the positions of the opposite sides of the welding member 4.
A motor 8 is arranged below the welding fixture 3, and a rotating shaft 81 of the motor 8 is connected with the welding fixture 3 to enable the welding fixture 3 to rotate (the rotating shaft of the welding fixture 3 is vertical to the horizontal plane). Specifically, the method comprises the following steps: the motor 8 is fixed on a support frame 9 below the motor, the air cylinder 7 is arranged below the support frame 9, the air cylinder 7 is fixed on the rack, and a piston rod of the air cylinder 7 is connected with the support frame 9; a piston rod of the air cylinder 7 can drive the support frame 9 and the motor 8 and the welding fixture 3 above the support frame to move up and down; the motor 8 can drive the welding fixture 3 and the welding part 4 to synchronously rotate through a rotating shaft 81 (not shown in the figure).
Example 3:
the present embodiment provides a welding method, including the following steps:
a. fix welding subassembly 4 in welding jig 3, welding subassembly 4 includes battery module 40 and U-shaped connection piece 42, battery module 40 piles up by several laminate polymer core and constitutes, U-shaped connection piece 42 sets up between the utmost point ear 41 of adjacent laminate polymer core, and two terminal surfaces that laminate polymer core is relative are provided with utmost point ear 41.
The U-shaped connecting sheet 42 is arranged between the tabs 41 of the adjacent soft-package battery cells and used for realizing series-parallel connection between the soft-package battery cells. In fact, this step provides a plurality of U-shaped connecting tabs 42 respectively between the tabs 41 on opposite sides of the weld 4.
The U-shaped connecting piece 42 comprises a connecting body 420 and a first flange 421 and a second flange 422 which are positioned at two opposite sides of the connecting body 420 and extend in the same direction; the first flange 421 is located above the second flange 422, and the first flange 421 extends in a direction away from the battery module 40. The outsides of the first and second flanges 421 and 422 contact the tab 41.
b. Adjusting the positions of a welding head 5 and a welding seat 6 of each of the first welding machine 1 and the second welding machine 2, so that the welding head 5 and the welding seat 6 of the first welding machine 1 clamp at least one tab 41 on one side of the battery module 40 and the flange of a U-shaped connecting piece 42 adjacent to the tab 41, and welding the tab 41 and the flange of the U-shaped connecting piece 42; the welding head 5 and the welding base 6 of the second welding machine 2 clamp at least one tab 41 on the other side of the battery module 40 and the flange of the U-shaped connecting piece 42 adjacent to the tab 41, and weld the tab 41 and the flange of the U-shaped connecting piece 42.
In fact, the welding seat 6 of the first welding machine 1 and the welding seat 6 of the second welding machine 2 are respectively in contact with the flanges of the U-shaped connecting pieces 42 on both sides of the battery module 40; the welding head 5 and the welding seat 6 of the first welding machine 1 clamp the flange and the tab 41 of the U-shaped connecting sheet 42 to be welded on one side of the battery module 40, and the welding head 5 and the welding seat 6 of the second welding machine 2 clamp the flange and the tab 41 of the U-shaped connecting sheet 42 to be welded on the other side of the battery module 40; the flanges of the tab 41 and the U-shaped connecting piece 42 are welded together.
And b, adjusting the relative positions of the welding heads 5, the welding seats 6 and the welding parts 4 of the first welding machine 1 and the second welding machine 2 respectively, enabling the welding seats 6 of the first welding machine 1 and the second welding machine 2 to respectively press the flanges of the U-shaped connecting sheets 42 on two opposite sides of the battery module 40, enabling the welding heads 5 of the first welding machine 1 and the second welding machine 2 to respectively press the lugs 41 on two opposite sides of the battery module 40, and welding the lugs 41 and the U-shaped connecting sheets 42 together.
Specifically, the welding seat 6 and the welding head 5 of the first welding machine 1 clamp and weld a first flange 421 of a U-shaped connecting piece 42 to be welded and a tab 41 corresponding to the first flange 421; the welding seat 6 and the welding head 5 of the second welding machine 2 clamp and weld the first flange 421 of one to-be-welded U-shaped connecting piece 42 on the other side of the battery module and the tab 41 corresponding to the first flange 421.
c. And adjusting the distance between the welding head 5 and the welding seat 6 of each of the first welding machine 1 and the second welding machine 2, and adjusting the distance between each of the first welding machine 1 and the second welding machine 2 and the welding part 4, so that the welding part 4 is separated from the corresponding welding head 5 and welding seat 6.
In fact, the welding heads 5 and the welding seats 6 of the first welding machine 1 and the second welding machine 2 respectively release the clamping of the flange of the U-shaped connecting piece 42 and the tab 41.
c1. The driving means drives the welding member 4 to move linearly so that the welding member 4 moves linearly with respect to the first welding machine 1 and the second welding machine 2, and then repeats steps b and c.
In fact, the battery module 40 and the U-shaped connecting piece 42 are synchronously moved in the vertical direction, and then steps b and c are repeated.
Step c1 is where the welding jig 3 is moved in the vertical direction, and the battery module 40 and the U-shaped connecting piece 42 are moved in synchronization with the welding jig 3.
Welding jig 3 moves along vertical direction, and is specific: an air cylinder 7 is arranged above the welding fixture 3, the air cylinder 7 is fixed on the rack, and the welding fixture 3 moves in the vertical direction under the action of the air cylinder 7; one side of welding jig 3 is provided with support frame 9, and the piston rod of cylinder 7 is connected with support frame 9, and support frame 9 can be reciprocating motion in vertical direction under the effect of cylinder 7, and welding jig 3 passes through motor 8 with support frame 9 to be connected (motor 8 fixes on support frame 9, and motor 8's pivot 81 is connected with welding jig 3), and motor 8 and welding jig 3 are reciprocating motion in vertical direction along with support frame 9.
After the welding part 4 moves, the welding head 5 and the welding seat 6 of the first welding machine 1 clamp the first flange 421 of the other U-shaped connecting piece 42 and the lug 41 corresponding to the first flange 421, and weld the first flange 421 and the lug together; meanwhile, the welding head 5 and the welding seat 6 of the second welding machine 2 clamp and weld the first flange 421 of the other to-be-welded U-shaped connecting piece 42 on the other side of the battery module and the tab 41 corresponding to the first flange 421.
d. The driving means drives the welding members 4 to rotate between the first welding machine 1 and the second welding machine 2, interchanges the positions of the opposite faces of the battery module 40, and then repeats steps b and c.
In fact, the battery module 40 and the U-shaped tabs 42 are synchronously rotated between the first welding machine 1 and the second welding machine 2, so that the positions of both the upper and lower faces of the battery module 40 are interchanged, and then the steps b and c are repeated.
In the step d, the welding jig 3 rotates between the first welding machine 1 and the second welding machine 2, and the battery module 40 and the U-shaped connecting piece 42 rotate (rotate) synchronously with the welding jig 3.
The welding jig 3 is rotated between the first welding machine 1 and the second welding machine 2, so that the positions of the upper and lower surfaces of the weldment 4 are interchanged. Specifically, the method comprises the following steps: the welding heads 5 of the first welding machine 1 and the second welding machine 2 are arranged above the welding seats 6, and the welding fixture 3 is rotated by 180 degrees under the action of the motor 8 (the rotating shaft of the welding fixture 3 is parallel to the horizontal plane).
The welding part 4 rotates 180 degrees (the rotating shaft of the welding part 4 is parallel to the horizontal plane), so that the positions of the upper surface and the lower surface of the welding part 4 are exchanged, after the rotation, the first flange 421 is positioned below the second flange 422, and the welding head 5 and the welding base 6 of the first welding machine 1 clamp and weld the second flange 422 of the U-shaped connecting sheet 42 to be welded and the lug 41 corresponding to the second flange 422 together; meanwhile, the welding head 5 and the welding seat 6 of the second welding machine 2 clamp and weld the second flange 422 of one U-shaped connecting sheet 42 on the other side of the battery module and the tab 41 corresponding to the second flange 422 together; and finally, series and parallel connection between the soft-package battery cells is realized, and after rotation, the upper surface of the second wing edge 422 is actually welded with the tab 41.
Finally, synchronously moving the battery module 40 and the U-shaped connecting piece 42 in the vertical direction, and then repeating the steps b and c; at this time, the battery module 40 and the U-shaped connecting piece 42 move in the opposite direction to the direction in which the welding member 4 moves in step c1.
The first welder 1 and the second welder 2 are ultrasonic welders.
Example 4:
the present embodiment provides a welding method, including the following steps:
a. fix welding subassembly 4 in welding jig 3, welding subassembly 4 includes battery module 40 and U-shaped connection piece 42, battery module 40 piles up by several laminate polymer core and constitutes, U-shaped connection piece 42 sets up between the utmost point ear 41 of adjacent laminate polymer core, and two terminal surfaces that laminate polymer core is relative are provided with utmost point ear 41.
The U-shaped connecting sheet 42 is arranged between the tabs 41 of the adjacent soft-package battery cells and used for realizing series-parallel connection between the soft-package battery cells. In fact, this step provides a plurality of U-shaped connecting tabs 42 respectively between the tabs 41 on opposite sides of the weld 4.
The U-shaped connecting piece 42 comprises a connecting body 420 and a first flange 421 and a second flange 422 which are positioned at two opposite sides of the connecting body 420 and extend in the same direction; the first flange 421 is located above the second flange 422, and the first flange 421 extends in a direction away from the battery module 40. The outer sides of the first and second flanges 421 and 422 are in contact with the tab 41 (the upper surface of the first flange 421 and the lower surface of the second flange 422 are in contact with the tab 41).
b. Adjusting the positions of a welding head 5 and a welding seat 6 of each of the first welding machine 1 and the second welding machine 2, so that the welding head 5 and the welding seat 6 of the first welding machine 1 clamp at least one tab 41 on one side of the battery module 40 and the flange of a U-shaped connecting piece 42 adjacent to the tab 41, and welding the tab 41 and the flange of the U-shaped connecting piece 42; the welding head 5 and the welding base 6 of the second welding machine 2 clamp at least one tab 41 on the other side of the battery module 40 and the flange of the U-shaped connecting piece 42 adjacent to the tab 41, and weld the tab 41 and the flange of the U-shaped connecting piece 42.
The welding seat 6 of the first welding machine 1 and the welding seat 6 of the second welding machine 2 are respectively contacted with the flanges of the U-shaped connecting sheets 42 at two sides of the battery module 40; the welding head 5 and the welding seat 6 of the first welding machine 1 clamp the flange and the tab 41 of the U-shaped connecting sheet 42 to be welded on one side of the battery module 40, and the welding head 5 and the welding seat 6 of the second welding machine 2 clamp the flange and the tab 41 of the U-shaped connecting sheet 42 to be welded on the other side of the battery module 40; the flanges of the tab 41 and the U-shaped connecting piece 42 are welded together.
The welding head 5 of the first welding machine 1 is arranged above the welding seat 6 of the first welding machine, the welding head 5 of the second welding machine 2 is arranged below the welding seat 6 of the second welding machine, and the welding head 5 and the welding seat 6 of the first welding machine 1 clamp and weld the first flange 421 of the U-shaped connecting sheet 42 to be welded and the lug 41 on the upper surface of the first flange and the lug 41 together; meanwhile, the welding head 5 and the welding holder 6 of the second welding machine 2 clamp and weld the second flange 422 of the U-shaped connecting piece 42 on the other side of the battery module 40 and the tab 41 on the lower surface thereof together.
c. And adjusting the distance between the welding head 5 and the welding seat 6 of each of the first welding machine 1 and the second welding machine 2, and adjusting the distance between each of the first welding machine 1 and the second welding machine 2 and the welding part 4, so that the welding part 4 is separated from the corresponding welding head 5 and welding seat 6.
The welding head 5 and the welding seat 6 of the first welding machine 1 and the second welding machine 2 respectively release the clamping of the flange of the U-shaped connecting piece 42 and the lug 41.
c1. The driving means drives the welding member 4 to move linearly so that the welding member 4 moves linearly with respect to the first welding machine 1 and the second welding machine 2, and then repeats steps b and c.
The battery module 40 and the U-shaped connecting piece 42 are synchronously moved in the vertical direction, and then steps b and c are repeated.
d. The driving means drives the welding members 4 to rotate between the first welding machine 1 and the second welding machine 2, interchanges the positions of the opposite faces of the battery module 40, and then repeats steps b and c.
The battery module 40 and the U-shaped tabs 42 are synchronously rotated between the first welding machine 1 and the second welding machine 2 to interchange the positions of the opposite sides of the battery module 40, and then steps b and c are repeated.
Specifically, the method comprises the following steps: the welding fixture 3 moves along the vertical direction first, so that the battery module 40 and the U-shaped connecting sheet 42 move synchronously in the vertical direction; then, the welding jig 3 is rotated by 180 ° (the rotation axis of the welding jig 3 is perpendicular to the horizontal plane) by the motor 8, so that the battery module 40 and the U-shaped connecting tab 42 are rotated synchronously between the first welding machine 1 and the second welding machine 2.
A motor 8 is arranged below the welding fixture 3, a rotating shaft 81 of the motor 8 is connected with the welding fixture 3, and the welding fixture 3 can be rotated through the rotating shaft 81 (the rotating shaft of the welding fixture 3 is vertical to the horizontal plane); the motor 8 is fixed on a support frame 9 below the motor, the air cylinder 7 is arranged below the support frame 9, the air cylinder 7 is fixed on the rack, and a piston rod of the air cylinder 7 is connected with the support frame 9; the piston rod of the cylinder 7 can drive the support frame 9 and the motor 8 and the welding fixture 3 above the support frame to move up and down.
Finally, synchronously moving the battery module 40 and the U-shaped connecting piece 42 in the vertical direction, and then repeating the steps b and c; at this time, the battery module 40 and the U-shaped connecting piece 42 move in the opposite direction to the direction in which the welding member 4 moves in step c1.
The first welder 1 and the second welder 2 are ultrasonic welders.
The above description is only for some embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. The protection scope of the present invention is subject to the protection scope of the claims.

Claims (10)

1.一种焊接装置，其特征在于，包括第一焊接机、第二焊接机和用于固定焊接件的焊接夹具，焊接夹具设置在第一焊接机和第二焊接机之间，所述焊接件包括电池模组，所述第一焊接机和第二焊接机为超声波焊接机；所述第一焊接机至少包括焊头和焊座，所述第二焊接机至少包括焊头和焊座，第一焊接机和第二焊接机分别调节其焊头、焊座与焊接件之间的相对位置；所述焊接件还包括U形连接片，所述电池模组由数个电芯堆叠组成，所述U形连接片设置在相邻电芯的极耳之间，U形连接片上设有翼缘，电池模组一侧的至少一个极耳和与该极耳相邻的U形连接片的翼缘连接，焊接时所述焊头与极耳接触，所述焊座与所述翼缘接触，焊接夹具与驱动装置连接，使得焊接件在驱动装置的驱动下做直线和旋转运动。1. A welding device is characterized in that, comprising a first welding machine, a second welding machine and a welding fixture for fixing a welding piece, the welding fixture is arranged between the first welding machine and the second welding machine, and the welding fixture is arranged between the first welding machine and the second welding machine. The component includes a battery module, the first welding machine and the second welding machine are ultrasonic welding machines; the first welding machine at least includes a welding head and a welding seat, and the second welding machine at least includes a welding head and a welding seat, The first welding machine and the second welding machine adjust the relative positions of the welding head, the welding seat and the welding piece respectively; the welding piece further includes a U-shaped connecting piece, and the battery module is composed of a stack of several battery cells, The U-shaped connecting piece is arranged between the tabs of the adjacent battery cores, the U-shaped connecting piece is provided with a flange, and at least one tab on one side of the battery module and the U-shaped connecting tab adjacent to the tab are connected. The flange is connected, the welding head is in contact with the tab, the welding seat is in contact with the flange, and the welding fixture is connected with the driving device, so that the welding piece can move linearly and rotationally under the driving of the driving device. 2.如权利要求1所述的一种焊接装置，其特征在于：第一焊接机和第二焊接机分别对焊接件的相对的两个面进行焊接。2 . The welding device according to claim 1 , wherein the first welding machine and the second welding machine respectively weld two opposite surfaces of the welding piece. 3 . 3.如权利要求1所述的一种焊接装置，其特征在于：第一焊接机和第二焊接机同时对焊接件进行焊接。3 . The welding device according to claim 1 , wherein the first welding machine and the second welding machine simultaneously weld the welded parts. 4 . 4.如权利要求1所述的一种焊接装置，其特征在于：所述驱动装置包括气缸和电机，所述气缸驱动焊接夹具做轴向移动，所述电机驱动焊接夹具做旋转运动。4. The welding device according to claim 1, wherein the driving device comprises a cylinder and a motor, the cylinder drives the welding fixture to move axially, and the motor drives the welding fixture to rotate. 5.如权利要求4所述的一种焊接装置，其特征在于：所述电机驱动焊接件旋转，所述焊接件的旋转轴与水平面垂直或平行。5 . The welding device according to claim 4 , wherein the motor drives the welding piece to rotate, and the rotation axis of the welding piece is perpendicular or parallel to the horizontal plane. 6 . 6.如权利要求1所述的一种焊接装置，其特征在于：所述第一焊接机的焊头和第二焊接机的焊头设置在各自的焊座的相同侧，或者所述第一焊接机的焊头和第二焊接机的焊头设置在各自的焊座的相反侧。6. The welding device according to claim 1, wherein the welding head of the first welding machine and the welding head of the second welding machine are arranged on the same side of their respective welding seats, or the first welding machine The welding head of the welding machine and the welding head of the second welding machine are arranged on opposite sides of the respective welding seats. 7.一种焊接件的焊接方法，其特征在于，利用权利要求1至6任一所述的焊接装置，并包括如下步骤：7. A welding method for welded parts, characterized in that, using the welding device according to any one of claims 1 to 6, and comprising the steps of: a.将焊接件固定在焊接夹具中，所述焊接件包括电池模组和U形连接片，所述电池模组由数个电芯堆叠组成，所述U形连接片设置在相邻电芯的极耳之间；a. Fix the welding piece in the welding fixture, the welding piece includes a battery module and a U-shaped connecting piece, the battery module is composed of a stack of several battery cells, and the U-shaped connecting piece is arranged on the adjacent battery cells between the polar ears; b.调节第一焊接机和第二焊接机各自的焊头和焊座的位置，使第一焊接机的焊头和焊座夹紧电池模组一侧的至少一个极耳和与该极耳相邻的U形连接片的翼缘，将该极耳和U形连接片的翼缘焊接；第二焊接机的焊头和焊座夹紧电池模组另一侧的至少一个极耳和与该极耳相邻的U形连接片的翼缘，将该极耳和U形连接片的翼缘焊接；b. Adjust the positions of the respective welding heads and welding bases of the first welding machine and the second welding machine, so that the welding heads and welding bases of the first welding machine clamp at least one tab on one side of the battery module and are connected with the tab. The flange of the adjacent U-shaped connecting piece is welded to the flange of the U-shaped connecting piece; the welding head and the welding seat of the second welding machine clamp at least one of the tabs on the other side of the battery module and the flange of the U-shaped connecting piece. The flange of the U-shaped connecting piece adjacent to the tab is welded with the flange of the U-shaped connecting piece; c.调节第一焊接机和第二焊接机各自的焊头与焊座之间的距离，调节第一焊接机和第二焊接机各自与焊接件的距离，使得焊接件从相应的焊头和焊座之间脱出；c. Adjust the distance between the welding head and the welding seat of the first welding machine and the second welding machine, and adjust the distance between the first welding machine and the second welding machine and the welding piece, so that the welding piece is separated from the corresponding welding head and the welding piece. come out between the welding seats; d.驱动装置驱动焊接件在第一焊接机和第二焊接机之间旋转，使电池模组相对的两个面位置互换,然后重复步骤b和步骤c。d. The driving device drives the welding parts to rotate between the first welding machine and the second welding machine, so that the positions of the two opposite faces of the battery module are interchanged, and then repeat steps b and c. 8.如权利要求7所述的焊接方法，其特征在于：步骤c还包括步骤c1:驱动装置驱动焊接件线性移动，使得焊接件相对于第一焊接机和/或第二焊接机做直线移动，然后重复步骤b和步骤c。8. welding method as claimed in claim 7, is characterized in that: step c also comprises step c1: drive device drives welding piece to move linearly, makes weldment move linearly with respect to the first welding machine and/or the second welding machine , then repeat steps b and c. 9.如权利要求7所述的焊接方法，其特征在于：所述电芯相对的两个端面设置有极耳。9 . The welding method according to claim 7 , wherein two opposite end faces of the electric core are provided with tabs. 10 . 10.如权利要求7所述的焊接方法，其特征在于：所述第一焊接机和第二焊接机对焊接件进行焊接时，焊头与电芯的极耳接触，焊座与U形连接片的翼缘接触。10. The welding method according to claim 7, wherein when the first welding machine and the second welding machine weld the welding parts, the welding head is in contact with the tab of the cell, and the welding seat is connected with the U shape The flanges of the pieces are in contact.
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