CN114700604A - Ultrasonic welding method for tabs - Google Patents
Ultrasonic welding method for tabs Download PDFInfo
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- CN114700604A CN114700604A CN202210268293.6A CN202210268293A CN114700604A CN 114700604 A CN114700604 A CN 114700604A CN 202210268293 A CN202210268293 A CN 202210268293A CN 114700604 A CN114700604 A CN 114700604A
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- 238000003466 welding Methods 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000011888 foil Substances 0.000 claims abstract description 339
- 239000002131 composite material Substances 0.000 claims abstract description 86
- 238000010030 laminating Methods 0.000 claims abstract description 7
- 238000003475 lamination Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000035515 penetration Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
Abstract
The invention relates to an ultrasonic welding method for a tab, which comprises the following steps: sequentially unreeling a first foil, a composite foil and a second foil to enable the first foil, the composite foil and the second foil to be sequentially laminated to form an intermediate of a laminated foil, and respectively welding the first foil and the second foil on two opposite surfaces of the composite foil in an ultrasonic welding mode to obtain the laminated foil; and laminating the laminated foils to a set number of layers, and sequentially welding the laminated foils by adopting an ultrasonic welding mode to form a laminated weldment. According to the invention, the first foil, the composite foil and the second foil are sequentially laminated, and during welding, energy is directly acted on the first foil and the second foil by ultrasonic welding, so that the energy generated by the ultrasonic welding directly contacting the composite foil can be reduced, the problems of over-welding, welding penetration and insufficient welding in the welding process are effectively avoided, and the welding effect is ensured; and then the plurality of laminated foils are sequentially laminated and welded, so that the distance between the plurality of laminated foils can be shortened.
Description
Technical Field
The invention relates to the technical field of battery processing, in particular to an ultrasonic welding method for a tab.
Background
In the process of welding a tab of a lithium ion battery pole piece foil, the traditional welding mode adopts laser welding and ultrasonic welding, the laser welding is an efficient and precise welding method which utilizes a laser beam with high energy density as a heat source, the welding process belongs to a heat conduction type, namely, laser radiates the surface of a heating material, the surface heat is diffused inwards through heat conduction, and the material is melted by controlling parameters such as the width, the energy, the peak power, the repetition frequency and the like of laser pulse to form a specific molten pool; ultrasonic welding is carried out by converting 50/60 Hz current into 15, 20, 30 or 40KHz electric energy through an ultrasonic generator. The converted high-frequency electrical energy is converted again into mechanical motion of the same frequency by the transducer, and the mechanical motion is then transmitted to the welding head by a set of amplitude transformer devices which can change the amplitude. The weld head transfers the received vibrational energy to the joint of the work pieces to be welded, where the vibrational energy is frictionally converted to thermal energy to melt the plastic and thereby form the weld area.
The existing battery pole piece foil generally adopts composite foil, the structure of the composite foil sequentially comprises a bottom layer, a middle layer and an upper layer, the bottom layer and the upper layer both adopt foil, the middle layer adopts plastic film, the strength of the plastic film is low, the bottom layer and the upper layer are only 2-3 mu m, the ductility and tensile strength of the bottom layer and the upper layer are too high, the absorption performance is not strong, and the problems of over-welding, penetration, insufficient power, and the like can be caused by using the two welding modes.
Disclosure of Invention
Therefore, it is necessary to provide an ultrasonic tab welding method which can effectively avoid the problems of over-welding, through-welding and cold-joint in the welding process, ensure the welding effect and ensure the electrical conductivity.
An ultrasonic welding method for a tab comprises the following steps:
sequentially unreeling a first foil, a composite foil and a second foil, so that the first foil, the composite foil and the second foil are sequentially laminated to form an intermediate of a laminated foil;
welding the first foil and the second foil on two opposite surfaces of the composite foil respectively in an ultrasonic welding mode to obtain laminated foils;
laminating the laminated foils to a set number of layers, and sequentially welding the laminated foils by adopting the ultrasonic welding mode to form a laminated weldment;
and welding the laminated weldment and the lug by adopting the ultrasonic welding mode to form a lug assembly.
The method comprises the following steps that first foil, composite foil and second foil are sequentially stacked and welded together in an ultrasonic welding mode, energy is directly acted on the first foil and the second foil through ultrasonic welding during welding, the first foil and the second foil play a role in protecting the composite foil, the energy generated by ultrasonic welding in direct contact with the composite foil can be reduced, the risk that the composite foil is easy to break during welding is reduced, the problems of over-welding, welding penetration and insufficient welding caused during welding are effectively avoided, and the welding effect of the first foil, the composite foil and the second foil can be guaranteed; then, a plurality of laminated foils are sequentially laminated and welded by adopting an ultrasonic welding mode, so that the distance between the laminated foils can be shortened, and the welding energy consumption can be reduced; and then, welding the laminated weldment with the lug in an ultrasonic welding mode, so that the tensile strength of the lug in welding is increased, the laminated weldment is in contact with the lug, and the electric conductivity is ensured.
In one embodiment, before welding the first foil and the second foil to the two opposite surfaces of the composite foil, respectively, the method further includes:
and sequentially laminating the first foil, the composite foil and the second foil to form an intermediate body of the laminated foil for pressing.
Through the midbody with the range upon range of foil that first foil, compound foil and second foil formed compresses tightly, can make first foil, the interval reduces between compound foil and the second foil, thereby make first foil, the second foil respectively and closely laminate between the compound foil, difficult relative displacement takes place, in order to guarantee first foil, the accuracy of compound foil and second foil relative position, and then can improve the welding quality of first foil, compound foil and second foil.
In one embodiment, the welding the first foil and the second foil to two opposite surfaces of the composite foil by the ultrasonic welding method includes:
the welding pressure of the ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 20-50Khz, and the welding speed is 10-15 r/min.
In one embodiment, the ultrasonic welding method is adopted to weld a plurality of laminated foils in sequence, or the ultrasonic welding method is adopted to weld the laminated weldment and a tab, and comprises the following steps of;
the welding pressure of the ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 30-40Khz, and the welding time is 0.3-0.5 s.
In one embodiment, the first foil and the second foil are respectively welded to two opposite surfaces of the composite foil in a continuous welding manner.
The first foil and the second foil are respectively welded on two opposite surfaces of the composite foil in a continuous welding mode. That is to say, first foil, composite foil and second foil are welded promptly in transportation process to form continuous welding seal on first foil and composite foil and second foil and composite foil, need not to suspend first foil, composite foil and second foil in transportation process, greatly shortened the welding time, improved welding efficiency.
In one embodiment, the thickness of the first foil and the second foil is 10-15 μm, and the thickness of the composite foil is 5-8 μm.
In one embodiment, the set number of layers is 15-40 layers.
In one embodiment, the ultrasonic welding method is adopted to weld the lamination weldment and the tab to form the tab assembly, and the method comprises the following steps:
according to the welding area of the lamination weldment and the lug.
In one embodiment, the first foil and the second foil are made of one of aluminum foil, copper foil and tin foil.
In one embodiment, the ultrasonic welding method for the tab further comprises the following steps:
and testing the welding tension of the tab assembly (2), and judging as a qualified product when the welding tension is more than or equal to 20N.
The invention provides an ultrasonic welding method of a tab, which comprises the steps of firstly, sequentially laminating a first foil, a composite foil and a second foil, and welding the first foil, the composite foil and the second foil together in an ultrasonic welding mode, wherein energy is directly acted on the first foil and the second foil by ultrasonic welding during welding, and the first foil and the second foil play a role in protecting the composite foil, so that the energy generated by the ultrasonic welding in direct contact with the composite foil can be reduced, the risk that the composite foil is easy to break during welding is reduced, the problems of over-welding, welding through and insufficient welding during welding are effectively avoided, and the welding effect of the first foil, the composite foil and the second foil can be ensured; then, a plurality of laminated foils are sequentially laminated and welded by adopting an ultrasonic welding mode, so that the distance between the laminated foils can be shortened, and the welding energy consumption can be reduced; and then, welding the laminated weldment with the lug in an ultrasonic welding mode, so that the tensile strength of the lug in welding is increased, the laminated weldment is in contact with the lug, and the conductivity is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a method for ultrasonic welding of a tab according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a first foil and a second foil being welded to opposite surfaces of a composite foil, respectively, according to an embodiment of the present invention, in which a structure of a seam welding head for welding the first foil, the composite foil, and the second foil is shown;
fig. 3 is a schematic diagram illustrating welding of a plurality of laminated foils in sequential lamination welding according to an embodiment of the present invention, which illustrates a structure of a second ultrasonic horn used for sequential lamination welding of the plurality of laminated foils;
fig. 4 is a schematic view illustrating welding of a laminate weldment to a tab according to an embodiment of the present invention, which shows the structure of a first ultrasonic horn used for welding the laminate weldment to the tab.
Description of the reference numerals
1. Laminating the foil; 11. a first foil; 12. compounding foil; 13. a second foil; 2. a tab assembly; 21. stacking weldments; 22. a tab; 3. a roll welding head; 3. a roll welding head; 4. a second ultrasonic horn; 5. a first ultrasonic horn.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 and 2, an embodiment of the present invention provides an ultrasonic tab welding method, which may weld a first foil 11, a composite foil 12, and a second foil 13 together to obtain a laminated foil 1, weld several laminated foils 1 together to form a laminated weldment 21, and weld the laminated weldment 21 and a tab 22 together.
The composite foil 12 comprises a third foil, a fourth foil and a plastic film layer arranged between the third foil and the fourth foil, and the third foil and the fourth foil are respectively bonded with the plastic film layer. In other possible embodiments, the third foil, the plastic film layer and the fourth foil are connected together by heat fusion in sequence. The thickness of the third foil and the fourth foil is 2-3 μm.
Referring to fig. 1, 2, 3 and 4, an ultrasonic welding method for a tab includes the following steps:
step 1: the first foil 11, the composite foil 12 and the second foil 13 are sequentially unreeled, so that the first foil 11, the composite foil 12 and the second foil 13 are sequentially stacked to form an intermediate of the stacked foil 1. The first foil 11 and the second foil 13 are made of one of aluminum foil, copper foil and tin foil.
Step 2: and respectively welding the first foil 11 and the second foil 13 on two opposite surfaces of the composite foil 12 by adopting an ultrasonic welding mode to obtain the laminated foil 1.
And step 3: the laminated foils 1 are laminated to a set number of layers, and a plurality of laminated foils 1 are welded in sequence by ultrasonic welding to form a laminated weldment 21.
And 4, step 4: the laminate weldment 21 is welded to the tab 22 by ultrasonic welding to form the tab assembly 2.
Referring to fig. 2, the first foil 11, the composite foil 12, and the second foil 13 are welded by ultrasonic welding in which high-frequency vibration waves are transmitted to the surfaces of two objects to be welded, and the surfaces of the two objects are rubbed against each other under pressure to form a fusion between the molecular layers. When welding, ultrasonic bonding directly acts on first foil 11 and second foil 13 with the energy, and first foil 11 and second foil 13 play the effect of protection composite foil 12, can reduce the energy that ultrasonic bonding direct contact composite foil 12 produced, have reduced composite foil 12 easy cracked risk in welding process, effectively avoid causing the problem of overwelding, penetration and rosin joint in welding process, can guarantee the welding effect of range upon range of foil 1.
In step 1, the first foil 11, the composite foil 12 and the second foil 13 are respectively wound on the unwinding roller, and the unwinding roller is driven to rotate by the unwinding driving portion, so that the first foil 11, the composite foil 12 and the second foil 13 can be sequentially unwound. Wherein, unreel drive division and adopt the motor. It is to be understood that: because first foil 11, composite foil 12 and second foil 13 are the thin material, and its intensity is not high and can't bear great tear power, need guarantee that relative position is fixed when welding first foil 11, composite foil 12 and second foil 13, otherwise will appear the crackle after the welding, produce the disconnected continuous production of taking when serious. For this purpose, the first foil 11, the composite foil 12 and the second foil 13 are laminated in this order before welding, and the first foil 11, the composite foil 12 and the second foil 13 are conveyed in the same direction. Meanwhile, the conveying speeds of the first foil 11, the composite foil 12 and the second foil 13 are kept consistent in the conveying process so as to reduce the speed difference among the first foil 11, the composite foil 12 and the second foil 13, so that the relative positions of the first foil 11, the composite foil 12 and the second foil 13 are fixed, and the welding quality of the first foil 11, the composite foil 12 and the second foil 13 can be improved.
Specifically, first foil 11, composite foil 12 and second foil 13 are all transported along the horizontal direction to the welding station that welds first foil 11 and second foil 13 respectively in the relative two surfaces of composite foil 12, can reduce first foil 11, composite foil 12 and second foil 13 and appear the phenomenon of breaking over, corrugating in transportation process, and roughness when effectively guaranteeing to weld further guarantees welding quality.
In order to realize that the first foil 11, the composite foil 12 and the second foil 13 are all conveyed to the welding station along the horizontal direction, the following settings can be made:
the unwinding roller wound with the first foil 11 and the unwinding roller wound with the second foil 13 are symmetrically arranged, and the unwinding roller wound with the composite foil 12 is arranged between the unwinding roller wound with the first foil 11 and the unwinding roller wound with the second foil 13 in the first direction, and is spaced from the unwinding roller wound with the first foil 11 and the unwinding roller wound with the second foil 13 in the second direction, respectively. The first direction intersects the second direction perpendicularly. It is to be understood that: the composite foils 12 are respectively arranged in parallel with the first foil 11 and the second foil 13, the composite foils 12 are positioned between the first foil 11 and the second foil 13, and meanwhile, the first foil 11 and the second foil 13 are symmetrically arranged relative to the composite foils 12. When the first foil 11 and the second foil 13 are respectively unreeled, the first foil 11 and the second foil 13 can enter the welding station through paths with the same length, so that the tension difference between the first foil 11 and the second foil 13 can be reduced, and the flatness of the first foil 11, the composite foil 12 and the second foil 13 during lamination is ensured.
Referring to fig. 2, in step 2, the first foil 11 and the second foil 13 are respectively welded to two opposite surfaces of the composite foil 12 by continuous welding. It should be understood that the first foil 11, the composite foil 12 and the second foil 13 are welded during the conveying process, and continuous welding marks are formed on the first foil 11 and the composite foil 12 and the second foil 13 and the composite foil 12, so that the first foil 11, the composite foil 12 and the second foil 13 do not need to be paused during the conveying process, the welding time is greatly shortened, and the welding efficiency is improved.
In order to ensure the accuracy of the relative positions of the first foil 11, the composite foil 12 and the second foil 13, before the first foil 11 and the second foil 13 are respectively welded on the two opposite surfaces of the composite foil 12, the intermediate of the laminated foil 1 formed by the first foil 11, the composite foil 12 and the second foil 13 is compressed, so that the interval between the first foil 11, the composite foil 12 and the second foil 13 is reduced, the first foil 11 and the second foil 13 are respectively tightly attached to the composite foil 12, and relative displacement is not easy to occur. For example, before the first foil 11 and the second foil 13 are not compressed, the first foil 11 and the second foil 13 are spaced from the composite foil 12 by 0.5-1mm, and the first foil 11, the second foil 13 and the composite foil 12 are compressed by 0-0.2 mm.
The thickness of the first foil 11 and the second foil 13 may be selected between 10-15 μm, and the thickness of the composite foil 12 may be selected between 5-8 μm. In the present embodiment, the first foil 11 and the second foil 13 have a thickness of 12 μm, and the composite foil has a thickness of 126 μm.
Referring to fig. 2, in one embodiment, the first foil 11, the composite foil 12 and the second foil 13 are welded by ultrasonic seam welding, which includes two seam welding heads 3, wherein the two seam welding heads 3 are respectively disposed on the upper and lower sides of the laminated foil 1 and are symmetrically disposed with respect to the laminated foil 1. When the first foil 11 and the second foil 13 are respectively welded on two opposite surfaces of the composite foil 12 by adopting an ultrasonic welding mode, a welding area of 30-50mm is reserved, the welding pressure of ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 20-50Khz, the welding speed is 10-15r/min, the diameter of an ultrasonic welding head is about 100mm, and the ultrasonic welding head is a circular welding head. For example, the ultrasonic horn is a circular roller.
Further, after the step 2 is finished, the first foil 11, the second foil 13 and the composite foil 12 after the rolling welding, that is, the laminated foil 1 after the rolling welding, may be further rolled. In order to realize the laminated foil 1 after the rolling welding, the following settings can be made: the winding roller and the winding driving portion are arranged, the laminated foil 1 is wound on the winding roller, the winding roller is driven to rotate by the winding driving portion, and the laminated foil 1 after being wound and welded can be achieved. Before step 3, the rolled laminated foil 1 needs to be cut according to a required length, and then the laminated foil 1 is laminated to a set number of layers. The number of layers set can be selected between 15 and 40. In the present embodiment, the number of layers of the laminate weldment 21 is 20.
Referring to fig. 3, in step 3, when a plurality of laminated foils 1 are welded in sequence by using an ultrasonic welding method, a second ultrasonic welding head 4 is used, and the second ultrasonic welding head 4 is square and has no welding teeth. The welding pressure of ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 30-40Khz, and the welding time is 0.3-0.5 s. Adopt the ultrasonic bonding mode to weld a plurality of range upon range of foils 1 in proper order, can make the interval between a plurality of range upon range of foils 1 shorten, be favorable to reducing welding energy consumption.
Referring to fig. 4, in step 4, when the laminate weldment 21 is welded to the tab 22 by ultrasonic welding, the first ultrasonic horn 5 is used, the first ultrasonic horn 5 may be of any shape, and the first ultrasonic horn 5 is a spur horn. In the present embodiment, the first ultrasonic horn 5 is square. The welding pressure of ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 30-40Khz, and the welding time is 0.3-0.5 s. The laminated weldment 21 and the lug 22 are welded in an ultrasonic welding mode, so that the tensile strength of the lug 22 during welding is increased, the laminated weldment 21 is in contact with the lug 22, and the electric conductivity is guaranteed. When the laminate weldment 21 and the tab 22 are welded, the size or length of the first ultrasonic horn 5 used for welding is determined according to the welding area where the laminate weldment 21 and the tab 22 are welded. It will be appreciated that the first ultrasonic horn 5 size or length is in linear relationship with the welding area where the laminate weldment 21 and tab 22 are welded.
And (4) testing the welding tension of the tab assembly 2 after the step 4 is finished, and judging the tab assembly to be a qualified product when the welding tension is more than or equal to 20N, so as to meet the welding requirement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An ultrasonic welding method for a tab is characterized by comprising the following steps:
sequentially unreeling a first foil (11), a composite foil (12) and a second foil (13) to enable the first foil (11), the composite foil (12) and the second foil (13) to be sequentially stacked to form an intermediate of a stacked foil (1);
welding the first foil (11) and the second foil (13) to two opposite surfaces of the composite foil (12) respectively in an ultrasonic welding mode to obtain a laminated foil (1);
laminating the laminated foils (1) to a set number of layers, and sequentially welding the laminated foils (1) by adopting the ultrasonic welding mode to form a laminated weldment (21);
and welding the laminated weldment (21) and the tab (22) by adopting the ultrasonic welding mode to form a tab assembly (2).
2. The ultrasonic tab welding method according to claim 1, wherein before welding the first foil (11) and the second foil (13) to the opposite surfaces of the composite foil (12), respectively, the method further comprises:
and sequentially laminating the first foil (11), the composite foil (12) and the second foil (13) to form an intermediate body of the laminated foil (1) for compression.
3. The ultrasonic tab welding method according to claim 1, wherein the ultrasonic welding method for welding the first foil (11) and the second foil (13) to two opposite surfaces of the composite foil (12) respectively comprises:
the welding pressure of the ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 20-50Khz, and the welding speed is 10-15 r/min.
4. The ultrasonic welding method for the electrode lug according to claim 1, wherein the ultrasonic welding method is adopted to weld a plurality of laminated foils (1) in sequence, or the ultrasonic welding method is adopted to weld the laminated weldment (21) and the electrode lug (22), and comprises the following steps:
the welding pressure of the ultrasonic welding is 0.2-0.5Mpa, the welding frequency is 30-40Khz, and the welding time is 0.3-0.5 s.
5. The ultrasonic welding method for the electrode lug of the claim 1, characterized in that the first foil (11) and the second foil (13) are respectively welded on two opposite surfaces of the composite foil (12) in a continuous welding mode.
6. The ultrasonic welding method for the tabs according to claim 1, wherein the thicknesses of the first foil (11) and the second foil (13) are 10-15 μm, and the thickness of the composite foil (12) is 5-8 μm.
7. The ultrasonic welding method for the tabs according to claim 1, wherein the set number of layers is 15 to 40.
8. The ultrasonic tab welding method according to claim 1, wherein the ultrasonic welding method is adopted to weld the lamination weldment (21) and the tab (22) to form the tab assembly (2), and comprises the following steps:
according to the welding area of the lamination weldment (21) and the tab (22).
9. The ultrasonic welding method for the tabs according to claim 1, wherein the first foil (11) and the second foil (13) are made of one of aluminum foil, copper foil and tin foil.
10. The ultrasonic welding method for the tab as claimed in claim 1, further comprising the steps of:
and testing the welding tension of the tab assembly (2), and judging the tab assembly to be a qualified product when the welding tension is more than or equal to 20N.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210268293.6A CN114700604A (en) | 2022-03-18 | 2022-03-18 | Ultrasonic welding method for tabs |
| PCT/CN2022/094895 WO2023173585A1 (en) | 2022-03-18 | 2022-05-25 | Ultrasonic welding method for tab |
| PCT/CN2023/082200 WO2023174410A1 (en) | 2022-03-18 | 2023-03-17 | Tab ultrasonic welding method and tab welding device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210268293.6A CN114700604A (en) | 2022-03-18 | 2022-03-18 | Ultrasonic welding method for tabs |
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| CN114700604A true CN114700604A (en) | 2022-07-05 |
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| CN202210268293.6A Pending CN114700604A (en) | 2022-03-18 | 2022-03-18 | Ultrasonic welding method for tabs |
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| CN (1) | CN114700604A (en) |
| WO (1) | WO2023173585A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174410A1 (en) * | 2022-03-18 | 2023-09-21 | 江阴纳力新材料科技有限公司 | Tab ultrasonic welding method and tab welding device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006128038A (en) * | 2004-11-01 | 2006-05-18 | Nissan Motor Co Ltd | Battery structure body |
| CN203674299U (en) * | 2013-11-11 | 2014-06-25 | 浙江万向亿能动力电池有限公司 | Connection structure of laminated pole piece foils and tab of lithium battery |
| CN107234329A (en) * | 2017-05-25 | 2017-10-10 | 河南力旋科技股份有限公司 | A kind of pole ear welding method of soft pack cell |
| CN110948111A (en) * | 2019-12-09 | 2020-04-03 | 多氟多新能源科技有限公司 | Composite welding method for tab of soft package lithium ion battery |
| CN111180738A (en) * | 2019-06-28 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN111435727A (en) * | 2019-12-31 | 2020-07-21 | 蜂巢能源科技有限公司 | Battery tab welding structure, preparation method thereof and battery |
| CN111799471A (en) * | 2020-08-07 | 2020-10-20 | 北京新能源汽车技术创新中心有限公司 | Current collector, preparation method of current collector, solid-state battery and automobile |
| CN212412090U (en) * | 2020-05-29 | 2021-01-26 | 珠海冠宇电池股份有限公司 | Current collector and lithium ion battery |
| CN112824006A (en) * | 2019-11-21 | 2021-05-21 | 深圳市海瀚新能源技术有限公司 | Lug welding device and lug welding method |
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
| WO2022042665A1 (en) * | 2020-08-27 | 2022-03-03 | 比亚迪股份有限公司 | Electrode plate and lithium ion battery |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4869740B2 (en) * | 2006-03-02 | 2012-02-08 | Ｎｅｃエナジーデバイス株式会社 | Laminated lithium ion battery, method for producing the same, and laminated body |
| CN110277532A (en) * | 2018-03-15 | 2019-09-24 | 宁德时代新能源科技股份有限公司 | Processing method and processing equipment for secondary battery current collector |
| DE102018221843A1 (en) * | 2018-12-14 | 2020-06-18 | Volkswagen Aktiengesellschaft | Ultrasonic welding device and method for producing a metal foil stack |
| CN111509233A (en) * | 2020-05-29 | 2020-08-07 | 珠海冠宇电池股份有限公司 | Current collector and application thereof |
| CN111769289B (en) * | 2020-06-18 | 2023-04-07 | 合肥国轩高科动力能源有限公司 | Welding method of flexible current collector |
| CN112186130A (en) * | 2020-08-25 | 2021-01-05 | 合肥国轩高科动力能源有限公司 | Bipolar composite electrode plate and preparation method thereof |
| CN216054791U (en) * | 2021-08-23 | 2022-03-15 | 微宏动力系统（湖州）有限公司 | Composite foil, battery pole piece and secondary battery |
-
2022
- 2022-03-18 CN CN202210268293.6A patent/CN114700604A/en active Pending
- 2022-05-25 WO PCT/CN2022/094895 patent/WO2023173585A1/en unknown
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006128038A (en) * | 2004-11-01 | 2006-05-18 | Nissan Motor Co Ltd | Battery structure body |
| CN203674299U (en) * | 2013-11-11 | 2014-06-25 | 浙江万向亿能动力电池有限公司 | Connection structure of laminated pole piece foils and tab of lithium battery |
| CN107234329A (en) * | 2017-05-25 | 2017-10-10 | 河南力旋科技股份有限公司 | A kind of pole ear welding method of soft pack cell |
| CN111180738A (en) * | 2019-06-28 | 2020-05-19 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN112824006A (en) * | 2019-11-21 | 2021-05-21 | 深圳市海瀚新能源技术有限公司 | Lug welding device and lug welding method |
| CN110948111A (en) * | 2019-12-09 | 2020-04-03 | 多氟多新能源科技有限公司 | Composite welding method for tab of soft package lithium ion battery |
| CN111435727A (en) * | 2019-12-31 | 2020-07-21 | 蜂巢能源科技有限公司 | Battery tab welding structure, preparation method thereof and battery |
| CN212412090U (en) * | 2020-05-29 | 2021-01-26 | 珠海冠宇电池股份有限公司 | Current collector and lithium ion battery |
| CN111799471A (en) * | 2020-08-07 | 2020-10-20 | 北京新能源汽车技术创新中心有限公司 | Current collector, preparation method of current collector, solid-state battery and automobile |
| WO2022042665A1 (en) * | 2020-08-27 | 2022-03-03 | 比亚迪股份有限公司 | Electrode plate and lithium ion battery |
| CN113451712A (en) * | 2021-07-29 | 2021-09-28 | 珠海冠宇电池股份有限公司 | Tab structure, battery, tab welding method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023174410A1 (en) * | 2022-03-18 | 2023-09-21 | 江阴纳力新材料科技有限公司 | Tab ultrasonic welding method and tab welding device |
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|---|---|
| WO2023173585A1 (en) | 2023-09-21 |
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