CN114535773A - Ultrasonic welding device and ultrasonic welding method - Google Patents
Ultrasonic welding device and ultrasonic welding method Download PDFInfo
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- CN114535773A CN114535773A CN202111265060.2A CN202111265060A CN114535773A CN 114535773 A CN114535773 A CN 114535773A CN 202111265060 A CN202111265060 A CN 202111265060A CN 114535773 A CN114535773 A CN 114535773A
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- welding
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- foil
- pressing plate
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses an ultrasonic welding device and an ultrasonic welding method, which comprise a welding head and a welding seat, wherein welding parts are symmetrically arranged on two sides of the welding head and are connected through a connecting part, a plurality of welding teeth which are arranged at intervals are arranged in the welding parts, and the welding teeth are regularly arranged to form straight strips with openings. The invention is beneficial to reducing the damage of the welding teeth at the edge of the welding part to the lug foil, avoiding the problem of the breakage of the lug foil and improving the product percent of pass.
Description
Technical Field
The invention relates to the technical field of connection of lithium battery pole pieces and foils, in particular to an ultrasonic welding device and an ultrasonic welding method.
Background
The pole piece foils are led out from one end of each lithium battery pole piece, and the pole piece foils on each pole piece are overlapped and welded together after being led out to form a conductive end, and then are connected with the pole lugs, and the pole lugs are connected with the pole columns. At present, the tab of the laminated soft-package lithium battery generally adopts an ultrasonic welding mode to pre-weld the lead foils between the pole pieces together to form a pre-welded foil, and then uses the ultrasonic welding mode to weld the tab metal and the pre-welded foil together, thereby achieving the purpose of welding. However, in the ultrasonic welding process, because the thickness of the foil led out from the pole piece is very small, generally about 0.02 mm, the outermost foil is easily broken by vibration during ultrasonic welding, so that metal chips are generated, especially, the required welding power is increased along with the increase of the number of layers of the pole piece of the battery, so that the damage of the outermost foil is aggravated, a large amount of metal chips are generated, the self-discharge of the battery is increased due to the existence of the metal chips, and the charge retention rate of the battery during storage is seriously reduced. The consistency of the grouped batteries is finally influenced, and the service life of the batteries is shortened; in severe cases, local micro short circuit and even short circuit of the battery can be caused, so that potential safety hazards of the battery are caused, and personal and property safety of a user is even harmed. For example, the chinese patent document discloses "an ultrasonic horn and ultrasonic welding device", which is published under the publication number CN211759162U, and includes a welding rod, a connecting portion and a horn portion connected in sequence, wherein at least one side surface of the horn portion is provided with a plurality of welding teeth, and top surfaces of the welding teeth are in an arc structure or a plane structure.
Disclosure of Invention
The invention provides an ultrasonic welding device and an ultrasonic welding method which are beneficial to weakening the small damage of a welding head to the edge of a foil electrode lug.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an ultrasonic welding device, includes bonding tool and welding seat, the both sides of symmetry are equipped with the weld part on the bonding tool, and the weld part passes through connecting portion to be connected, be equipped with the welding tooth of a plurality of interval arrangement in the weld part, weld the tooth and include the first surface with weld part fixed connection and keep away from the second surface of weld part, it forms the vertical bar that has the opening to weld tooth neatly arranged.
Adopt a new ultrasonic wave to weld tooth design of arranging, set up the opening on the welding tooth of regular range originally, help weakening the bonding tool in welding process, the damage of welding tooth pair utmost point ear foil piece at welding part edge avoids utmost point ear foil piece cracked problem, causes the product percent of pass low.
Preferably, the first surface and the second surface are concentric squares, and the area of the first surface is larger than that of the second surface. In the welding process, the welding pressure is gradually enhanced, the foil tab begins to deform under the action of the welding teeth, the speed of deformation of the foil tab can be slowed down due to the design of the first surface area and the second surface area, and the foil tab on the periphery of the welding teeth is prevented from being suddenly thinned to cause cracks on the foil tab on the edge of the welding teeth.
Preferably, the areas of the first surface and the second surface are both circular, the side face of the welding tooth is an arc face, and the area of the first surface is larger than that of the second surface. The cambered surface design also helps the pressure of the dispersion welding teeth on the foil electrode lug in the pressing process, and avoids the situation that the foil electrode lug is broken due to overlarge pressure at a certain position.
Preferably, a liftable pressing device is arranged on the welding head, the pressing device comprises a pressing plate, a telescopic rod and a mounting base plate fixedly connected with the welding head connecting part, one end of the telescopic rod is fixedly connected with the mounting base plate, the other end of the telescopic rod is fixedly connected with the pressing plate, and the distance between the initial position of the pressing plate and the welding seat is smaller than the distance between the welding part and the welding seat. During welding, the pressing device moves towards the welding seat along with the welding head, but because the distance between the initial position of the pressing plate and the welding seat is smaller than the distance between the welding part and the welding seat, the pressing plate is contacted with the foil tab earlier than the welding part, and limits and presses the foil tab; subsequently, the welding part of the welding head welds the foil electrode lug pressed by the pressing plate, and the problem that the foil electrode lug cannot move to cause poor welding effect in the welding process is solved.
Preferably, the telescopic rod is of a sleeving structure, a pressure spring is arranged in the telescopic rod, one end of the pressure spring is fixed on the installation bottom plate, and the other end of the pressure spring is fixed at the top of the telescopic rod. In the process that the welding head moves towards the welding seat, the pressure spring is slowly compressed, and the foil electrode lug is prevented from breaking due to sudden pressure; after the welding is finished, the spring is in the deformation recovery process, the telescopic rod automatically extends to finish the reset, and the use of an additional reset mechanism is reduced.
Preferably, the contact surface of the bent part of the foil tab and the pressing plate is arc-shaped. According to the arc design of the angle of buckling of foil utmost point ear of pressing the clamp plate, avoid the sharp emergence of tearing the foil utmost point ear condition according to clamp plate edge of wind, help improving the welding yields.
Preferably, an opening is formed in the middle of the pressing plate, and the depth of the opening is smaller than the height of the welding portion. According to the clamp plate, it is spacing to press foil utmost point ear earlier, and then, the opening that the weld part on the bonding tool passed on the clamp plate welds foil utmost point ear, and open-ended setting can be injectd the work area of bonding tool, helps improving the uniformity of product, just the opening also can be designed according to operating condition's needs.
An ultrasonic welding method applied to the ultrasonic welding device includes:
a. stacking a plurality of tab foils together;
b. b, operating the welding equipment to enable the pressing device and the welding head to descend together, wherein the pressing device fixes the tab and the foil in the step a, then, the welding part on the welding head is contacted with the tab and the foil through an opening on a pressing plate in the pressing device, and welding is carried out for one time to obtain a tab and a pole piece;
c. and (c) overlapping the tab pole piece obtained in the step (b) and a metal tab on the battery cell on a welding base, repeating the operation in the step (b), and performing secondary welding to obtain the tab.
Therefore, the invention has the following beneficial effects: (1) the welding teeth at the edge of the welding part damage the lug foils, so that the problem of the breakage of the lug foils is avoided, and the product yield is low; (2) the pressure of the welding teeth on the foil tabs in the pressing process is dispersed, and the phenomenon that the foil tabs are broken due to overlarge pressure at a certain position is avoided; (3) the position of the foil tab is limited, and the problem of poor welding effect caused by the fact that the foil tab cannot move in position in the welding process is solved.
Drawings
Fig. 1 is a schematic structural view in embodiment 1 of the present invention.
Fig. 2 is a plan view of the pressing plate in embodiment 1 of the present invention.
Fig. 3 is a front view of the pressing plate in embodiment 1 of the present invention.
FIG. 4 is a plan view of a welding tooth in embodiment 1 of the present invention.
Fig. 5 is a side view of a tooth in accordance with embodiment 1 of the present invention.
FIG. 6 is a layout of teeth in example 1 of the present invention.
Fig. 7 is a top view of a tooth in accordance with embodiment 2 of the present invention.
FIG. 8 is a side view of a tooth in embodiment 2 of the present invention.
FIG. 9 is a layout of teeth in example 2 of the present invention.
In the figure: 1. Welding head, 11, welding part, 12, connecting part, 13, welding tooth, 131, first surface, 132, second surface, 14, opening, 2, welding seat, 31, pressing plate, 311, opening, 32, telescopic rod, 33, mounting base plate, 4, tab foil, 5 and battery cell.
The invention is further described with reference to the following figures and embodiments.
Example 1
As shown in fig. 1 to 6, an ultrasonic welding device includes a welding head 1 and a welding seat 2, welding portions 11 are symmetrically disposed on two sides of the welding head 1, the welding portions 11 are connected through a connecting portion 12, a plurality of welding teeth 13 are disposed in the welding portions 11, the welding teeth 13 include a first surface 131 fixedly connected to the welding portions 11 and a second surface 132 far away from the welding portions 11, and the welding teeth 13 are regularly arranged to form straight bars with gaps 14.
Adopt a new ultrasonic wave to weld tooth design of arranging, set up opening 14 on the welding tooth 13 of regular arrangement originally, help weakening bonding tool 1 in welding process, the damage of welding tooth 13 at welding part 11 edge to utmost point ear foil 4 avoids the cracked problem of utmost point ear foil 4, causes the product percent of pass low.
Specifically, the number of the welding teeth 11 missing from the same row of the gap 14 can be 1-5.
Specifically, the first surface 131 and the second surface 132 are concentric squares, and the area of the first surface 131 is larger than that of the second surface 132. In the welding process, the welding pressure is gradually increased, the foil tab 1 begins to deform under the action of the welding teeth 11, and the deformation speed of the foil tab 4 can be slowed down by the design of the areas of the first surface 131 and the second surface 132, so that the foil tab 4 around the welding teeth 11 is prevented from being suddenly thinned, and the foil tab 4 at the edge of the welding teeth 11 is prevented from generating cracks.
Specifically, be equipped with the pressing device of liftable on bonding tool 1, pressing device includes pressing plate 31, telescopic link 32 and mounting plate 33 with bonding tool 1 connecting portion 12 fixed connection, the one end and the mounting plate 33 fixed connection of telescopic link 32, the other end and the pressing plate 31 fixed connection of telescopic link 2, the initial position of pressing plate 31 and the distance of welding seat 2 are less than the distance between welding portion 11 and the welding seat 2. During welding, the pressing device moves towards the welding seat 2 along with the welding head 1, but because the distance between the initial position of the pressing plate 31 and the welding seat 2 is smaller than the distance between the welding part 11 and the welding seat 2, the pressing plate 31 is contacted with the foil tab 4 than the welding part 11 line, and limits and presses the foil tab; subsequently, the welding part 11 of the welding head 1 welds the foil tab 4 pressed by the pressing plate 31, thereby ensuring that the foil tab does not move in position during welding and the welding effect is poor.
Specifically, the contact surface of the bent portion of the pressing plate 31 and the foil tab 4 is arc-shaped. According to the arc design of the angle of buckling of foil utmost point ear 4 of pressing board 31, avoid the emergence of the broken foil utmost point ear 4 condition in the sharp 31 edges of pressing board of wind, help improving the welding yields.
Specifically, the pressing plate 31 has an opening 311 in the middle, and the depth of the opening 311 is smaller than the height of the welding portion 11. Pressing plate 31 is earlier pressed foil utmost point ear 4 spacingly, and subsequently, welding part 11 on the bonding tool 1 passes opening 311 on pressing plate 31 and welds foil utmost point ear 4, and opening 311's setting can be injectd welding head 1's work area, helps improving the uniformity of product, just opening 311 also can design according to operating condition's needs.
Specifically, the telescopic rod 32 is of a sleeving structure, a pressure spring is arranged inside the telescopic rod 32, one end of the pressure spring is fixed on the installation bottom plate 33, and the other end of the pressure spring is fixed at the top of the telescopic rod 32. In the process that the welding head 1 moves towards the welding seat 2, the pressure spring is slowly compressed, and the foil electrode lug 4 is prevented from being broken due to sudden pressure; after the welding is finished, the spring is in the deformation recovery process, the telescopic rod 32 automatically extends to finish the reset, and the use of an additional reset mechanism is reduced.
An ultrasonic welding method applied to the ultrasonic welding device includes:
a. stacking a plurality of tab foils 4 together;
b. operating the welding equipment to enable the pressing device and the welding head 1 to descend together, wherein the pressing device fixes the tab foil 4 in the step a, and then the welding part 11 on the welding head 1 is contacted with the tab foil 4 through the opening 311 on the pressing plate 31 in the pressing device to perform primary welding to obtain a tab pole piece;
c. and (c) stacking the pole lug pole piece obtained in the step (b) and the metal pole lug on the battery cell 5 on the welding base 2, repeating the operation in the step (b), and performing secondary welding to obtain the pole lug.
Example 2
As shown in fig. 7 to 9, an ultrasonic welding device includes a welding head 1 and a welding seat 2, welding portions 11 are symmetrically disposed on two sides of the welding head 1, the welding portions 11 are connected by a connecting portion 12, a plurality of welding teeth 13 are disposed in the welding portions 11 and spaced from each other, each welding tooth 13 includes a first surface 131 fixedly connected to the welding portion 11 and a second surface 132 far away from the welding portion 11, and the welding teeth 13 are regularly arranged to form a straight strip with a notch 14. Be equipped with the pressing device of liftable on bonding tool 1, pressing device include press panel 31, telescopic link 32 and with bonding tool 1 connecting portion 12 fixed connection's mounting plate 33, the one end and the mounting plate 33 fixed connection of telescopic link 32, the other end and the press panel 31 fixed connection of telescopic link 2, the initial position of press panel 31 and the distance of welding seat 2 are less than the distance between welding part 11 and the welding seat 2. The contact surface of the bent part of the pressing plate 31 and the foil tab 4 is arc-shaped. An opening 311 is formed in the middle of the pressing plate 31, and the depth of the opening 311 is smaller than the height of the welding part 11.
Specifically, the number of rows of the welding teeth 11 which are missing from the gap 14 at the same row interval can be 1-5.
Specifically, the areas of the first surface 131 and the second surface 132 are both circular, and the side surface of the welding tooth 11 is an arc surface. The cambered surface design also helps to disperse the pressure of the welding teeth 11 on the foil tab 4 in the pressing process, and avoids the situation that the foil tab 4 is broken due to overlarge pressure at a certain position.
An ultrasonic welding method applied to the ultrasonic welding device includes: a. Stacking a plurality of tab foils 4 together;
b. operating the welding equipment to enable the pressing device and the welding head 1 to descend together, wherein the pressing device fixes the tab foil 4 in the step a, and then the welding part 11 on the welding head 1 is contacted with the tab foil 4 through the opening 311 on the pressing plate 31 in the pressing device to perform primary welding to obtain a tab pole piece;
c. and (c) stacking the pole lug pole piece obtained in the step (b) and the metal pole lug on the battery cell 5 on the welding base 2, repeating the operation in the step (b), and performing secondary welding to obtain the pole lug.
Claims (7)
1. The utility model provides an ultrasonic welding device, includes bonding tool (1) and welding seat (2), its characterized in that, the both sides of symmetry are equipped with welding part (11) on bonding tool (1), and welding part (11) are connected through connecting portion (12), be equipped with welding tooth (13) of a plurality of interval arrangement in welding part (11), weld tooth (13) including with welding part (11) fixed connection's first surface (131) and keep away from second surface (132) of welding part (11), it forms the straight strip that has opening (14) to weld tooth (13) neatly arranged.
2. An ultrasonic welding device according to claim 1, characterized in that said first (131) and second (132) surfaces are concentric squares, and the area of the first surface (131) is larger than the area of the second surface (132).
3. An ultrasonic welding device according to claim 1, characterized in that said first (131) and second (132) surfaces are circular, the sides of said tooth (13) are curved, and the area of the first surface (131) is greater than the area of the second surface (132).
4. An ultrasonic welding device according to claim 1, characterized in that the welding head (1) is provided with a liftable pressing device, the pressing device comprises a pressing plate (31), an expansion link (32) and a mounting base plate (33) fixedly connected with the connecting portion (12) of the welding head (1), one end of the expansion link (32) is fixedly connected with the mounting base plate (33), the other end of the expansion link (2) is fixedly connected with the pressing plate (31), and the distance between the initial position of the pressing plate (31) and the welding base (2) is smaller than the distance between the welding portion (11) and the welding base (2).
5. An ultrasonic welding device as defined in claim 4, characterised in that the contact surface of the pressing plate (31) with the bent foil tab (4) is curved.
6. An ultrasonic welding device according to claim 4, characterized in that the pressing plate (31) is provided with an opening (311) in the middle, the depth of the opening (311) being smaller than the height of the weld (11).
7. An ultrasonic welding method applied to the ultrasonic welding apparatus according to any one of claims 1 to 6, the method comprising:
a. stacking a plurality of tab foils (4) together;
b. operating the welding equipment to enable the pressing device and the welding head (1) to descend together, wherein the pressing device fixes the tab foil (4) in the step a, and then the welding part (11) on the welding head (1) is contacted with the tab foil (4) through an opening (311) on a pressing plate (31) in the pressing device to perform primary welding to obtain a tab pole piece;
c. and (c) stacking the tab pole piece obtained in the step (b) and a metal tab on the battery cell (5) on the welding base (2), repeating the operation in the step (b), and performing secondary welding to obtain the tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111265060.2A CN114535773A (en) | 2021-10-28 | 2021-10-28 | Ultrasonic welding device and ultrasonic welding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111265060.2A CN114535773A (en) | 2021-10-28 | 2021-10-28 | Ultrasonic welding device and ultrasonic welding method |
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| CN114535773A true CN114535773A (en) | 2022-05-27 |
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| CN202111265060.2A Pending CN114535773A (en) | 2021-10-28 | 2021-10-28 | Ultrasonic welding device and ultrasonic welding method |
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| CN111769289A (en) * | 2020-06-18 | 2020-10-13 | 合肥国轩高科动力能源有限公司 | Welding method of flexible current collector |
| CN112372132A (en) * | 2020-08-26 | 2021-02-19 | 万向一二三股份公司 | Ultrasonic welding head connecting module and connecting structure of welding head |
| CN214236726U (en) * | 2020-12-18 | 2021-09-21 | 微宏动力系统（湖州）有限公司 | Ultrasonic welding head and ultrasonic welding equipment |
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2021
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Patent Citations (9)
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| CN102513686A (en) * | 2011-12-02 | 2012-06-27 | 苏州冠硕新能源有限公司 | Ultrasonic welding head, ultrasonic welding equipment provided with same and method for welding battery poles by utilizing ultrasonic welding equipment |
| JP2015136731A (en) * | 2014-01-24 | 2015-07-30 | 日本アビオニクス株式会社 | welding equipment |
| JP2015199095A (en) * | 2014-04-08 | 2015-11-12 | 株式会社デンソー | Ultrasonic welding apparatus and method of manufacturing battery |
| CN207723682U (en) * | 2017-12-07 | 2018-08-14 | 无锡先导智能装备股份有限公司 | A kind of lug closes welder and winding apparatus |
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